Well, i'm currently on 4.7.4, but i want to move to 4.8.0. But i heard that i need to compile it in order to use it. It is true? isn't there anyway to upgrade to 4.8.0 without compiling?
If you go to http://qt.nokia.com/downloads you will notice that there are precompiled binary installers. Compiling from source is an option. Make sure you practice your googles a bit too.