Everyone gets on me that I need to install this. But it seems so complex, with all these different programs in it. How will it work with the mods I already have? What do I need to do to run it? Will it work continuously or do I have to reinstall it every time I need to use it, like CC Cleaner?

I have basically no head for tech stuff so please bear with me. If I say I don't understand something that's what it means and I'm not being snide, just as fair warning since people tend to misinterpret my confusion for obstinance.

What you need is to read what you can handle at the Nraas site and then, register at Nraas and ask your questions there. Seriously, that is where the Nraas discussions are most effective.
Here's most questions answered: http://nraas.wikispaces.com/Where+C...mation+And+Help

Also: most of your mods are fine with the Nraas suite. There are exceptions discussed (not listed as I originally said) at the link above.
All the Nraas mods stay installed. You don't even have to tweak them if you are content to let them act like they do straight out of the box but I think the tendency as one gets used to them is to want to play with them more.
If your computer runs The Sims 3 it will run Nraas, though I've seen people say that Story Progression mod can be kind of much for a marginal computer.

I'd start with Error Trap and Overwatch at a bare minimum.

Master Controller, Master Controller cheats.. and if you use CAW, Porter and Debug.

If all you want is keep your game running fairly smoothly: Install Error Trap and Overwatch and forget about the rest.

If you want to fix things that go wrong: Install Master Controller and its modules.

Most important commands for that: town reset. And fix the town inventories if necessary.
Do a CTRL+F search on the MC documentation page and you'll find the commands.

I've never had any conflicts with NRAAS mods.

NRAAS are just mods.* No need to do anything with them really. Just pop them in your mods folder like all the other ones you might have. They are just more complex and you can change things but you don't have to.

*No offense meant to Twallan or all the others at NRAAS. I say a little prayer to them at my little altar every time I open this wonderful monster of a game. Just wanted to clean up this seeming misconception of the OP that these are things that have to be maintained. Or that any technical knowledge is necessary.

If maybe you find it's not all that hard, you can start reading the helpful tips at NRAAS. And ask there. They are very helpful folks.

Master controller - Master controller cheats - DebugEnabler - Overwatch - Traveler - Woohooer - Portrait Panel - Shooless
I use all the above with no problem at all.
Instead i had problems with Errortrap, so i don't reccommend it to someone new to mods.

Traveler I've had problems with when I used it to send teens to university; it works, but is kinda buggy. One problem I had with university and traveler was when I messed up the settings and my sim keep repeating the last week of a two week university degree - and never graduated. That was with a YA.

DebugEnabler? Very easy to mess things up. Never, ever select "Log into Blaze" for example. That's one of the things where the instructions say "Don't do that". And be careful about transferring things around because it can put stuff in your inventory that you can't get out. You need DebugEnabler tho for populating world's with CAW. If not CAW, then I don't use it.

I also had problems with Errortrap - it catches errors that aren't errors. Yeah, there are settings, but I ended up disabling so many of the checks that it wasn't worth loading.

Woohooer is pretty good... I made a scoring file for it where sims with the Alien Servitude buff would... uh.. Woohoo. The EA scoring is a mix of traits, buffs, favorites, money and skills. Half a point for each skill level. What's that about? Woohooer scoring is neat but very basic. I don't use it anymore.

If anyone would like a proper discussion of what ErrorTrap does and what those logs are that aren't really errors, I would invite them to stop by NRaas and open up a discussion thread (free registration required). The (real) errors that it "traps" will still happen if the mod is not in place, but the player would have no way to know it until/unless their game crashes. There is typically no need to disable anything that it does and it does provide a fair amount of routine game file cleanup along the way. Yes, the routine reports can be annoying until one gets used to and eventually expects them to show up, but I wouldn't play without it.

Installing Nraas is easy. It's the same process for every module (ErrorTrap, Register, Overwatch etc). You just download the proper version (check what game version you have) and put the .package file in your mods folder. That's it.

Personally I would definitely recommend Master Controller, ErrorTrap and Overwatch. Besides that Master Controller Cheats has even more functions and Register is wonderful because my registers were always empty, but with Register it fills these roles automatically (or you can choose which Sims should work at certain registers).

Usually you don't have to change any settings when you put these mods into your mod folder. It was one of my biggest worries that I would need to look through all settings, but Nraas doesn't really change things if you don't want it to. So it's recommend to check the "Interactions" link on every Nraas module (example), but you don't need to know immediately what every setting does.

I agree. ErrorTrap is great. I used to have Nraas without it, but at some point my game suddenly bugged and I could hardly play it anymore (Sims frozen in place but moving their heads, long loading screens, thumbnails repeatedly loading in Buy/Build mode etc). I tried a lot of things, but nothing worked until I just added ErrorTrap to my mods. I started my game and immediately I got multiple error reports and my game was running smoothly again.
Oh, and yes - I haven't changed any settings either afaik. And the reports can be a bit annoying, but seeing one ErrorTrap pop up every few hours (or the nightly "deleted 50 cars" pop up) is less annoying than playing with a game that hardly works

The reports didn't bothered me, but Errotrap literally deleted 3/4 of the family i was playing in Monte Vista just for reasons, that's why i removed it (it was the only new mod i installed so it was without doubt the culprit). I swear it scared the hell out of me O_O

We would have worked pretty hard with you to find out why that happened if you came to our site and provided the script logs (or if you did do this, were we no help?). This is not typical behavior of the mod at all. It will remove useless shards of data and report "Deleted Sims Found/Removed" and things like that, but by the time ET gets its hands on data like that, the sims, objects, etc. being "removed" were already pretty much not really in your game anymore. Or they were so corrupt that the mod deemed them unusable. ET will also find and remove data copies associated with sims and objects that really exist in other connected worlds (e.g., by way of Traveler).

Something really unexpected must have happened there. Again, this is not at all typical.

Oh, I also recommend the NRAAS Mod updater...
http://nraas.wikispaces.com/Mod+Updater
It's a great utility. You set a downloads folder and your mods folder (I use ..Downloads\NRAAS and ..\mods\packages\NRAAS)
It tells you when there's an update if you're online.

I agree that ErrorTrap and Overwatch are useful with regards to fixing errors in the game and game performance, respectively.
Apart from that, I, personally, can absolutely no longer imagine playing without MasterController.

The only NRAAS mod that I've found needing to be tweaked after installing rather than just running with default settings is Story Progression, and that only because I really don't care that the neighbors in a brand new town are all getting jobs and starting school.It is welcome to do all that without telling me about it, so I restrict it from telling me about anything that isn't involving Blood or Personalities. (Seeing the Town Magnate getting demoted or fired for missing work too often is still funny.)

When I reinstalled TS3, first thing I did was get my Nraas mods back in the game. I added Error trap this time. Something seriously wrong with that maroon van, the one that looks like an old style mom van...Error trap always catches that thing. Nraas Mods really saves my game. I would never play TS3 with out them.

I've got 109 NRaas Mod files which is just about the entire NRaas Mod collection and my game is unplayable without that collection of Mods and it's also unplayable without AM to disable automatic school assignments.That was one issue that would often lead to the schools becoming overcrowded and students route failing on attempts to enter and it also cause route fails in transit to school when a student lived too far from the school's location.

I was brand new to mods and had only been playing the game for a few months when I installed ErrorTrap, Overwatch, and MasterController (and eventually most of the rest of the NRaas mods). I read the instructions and installed with no problems, and I noticed an immediate and dramatic improvement in gameplay.

I wouldn't still be playing this game without them, nor would I have bothered purchasing the rest of the XPs- my saves were starting to devolve into soggy, bug-ridden messes which is literally (read in Chris Traeger voice ) the fastest way to turn me off a game.