im really scared to try, like do i loose my warranty's and things? you have any guides or faQ's on how to do it?

This is your Bible: http://forum.xda-developers...

Find your phone and there will be guides upon guides on how to do it with your phone. Rooting is the easy part. It is installing your first custom rom that is a bit nerve racking...But once you do it the first time you will wonder why it took you so long to make your phone 2-3x as fast as it was.

Just read and read up some more and then follow the step by step guides and you will be fine. My G1 was WAY harder to work with than my Galaxy S is...In fact to root my Galaxy S I just had to use the One click program and it literally did it in One click of the mouse.

Most newer phones can be un-rooted for warranty reasons too. Just read through and that topic will be covered at xda along with the rooting process most of the time.