So I decided to get my first Smartphone SGS3

Originally Posted by Fuell 

Thanks for the info. I've been browsing the XDA forums. A bit over my head for a lot of the stuff. Wish I had actually kept up on it, even if I didn't have a smartphone, simply because I knew I'd get one sooner or later. But alas, I simply kept reading about the tech.
Oh well, another thing to immerse myself in I guess
And about getting to know the phone before jumping into the complex stuff. Definitely. I find its been quite useful just playing around opening and checking out everything and anything to figure it out. I'm actually quite impressed. The only thing I'm a bit disappointed in is that I have the dual core, whereas I was kind of looking forward to the quad exynos over the dual qual. though I understand multicore on android isn't the biggest of benefit for most things. But I do notice the phone getting a little warm, something I'll be looking into soon. Not sure whats normal for smartphones, as I haven't used any more for than a few minutes playing with a friends, or at the store.

Originally Posted by t3lancer2006 

Most pre-installed (and uninstallable) apps that you find on your Galaxy S3 can be disabled by going into Settings -> App Manager -> Find The App (not a button called "find the app) -> Click Disable
This is so you don't have to root to get rid of bloatware.
OP,
I would suggest installing an aftermarket launcher like Nova Launcher and messing around with the settings to find something you like. You also picked a fantastic first Smartphone, but don't ever expect to get battery life like you would get with a feature/dumbphone because there is a lot going on with these phones. Most people claiming to get insane battery life never turn on their screens and it shows when they post a screenshot and it says "20% Screen" in their battery stats.
Also, there is no need to overclock your phone or undervolt the cpu because most of the battery drainage comes from your LTE modem and your screen. You'd probably see a VERY minor increase in batterylife with undervolting, while actually adding to instability. Don't worry about performance on your phone like you would on a PC.
If you want to install a Custom ROM, I would suggest looking at Cyanogenmod 10 as it has a nice mixture of features and stability. Google the proper Cyanogenmod wiki for your phone. Most people in the custom rom business make terribly ugly roms so CM10 is the only one I could suggest.
Finally, read the manual. The Galaxy S3 has a lot of cool features that are actually pretty nice during daily use. Smart Stay is one of my favorites because I hate when the screen turns off while I'm reading an article and not scrolling around.
P.S. DO NOT INSTALL APP KILLERs like Juice Defender or Advanced Task Killer. They do nothing but slow down booting up apps and serve no purpose in Android, as Android just freezes the app in the background when its not using them.