Gentoo's great. In fact, why are you here? The Gentoo
doc on this very thing is much easier to follow since it tells you how to set GNOME, KDE, or whatever up very easily. That's why I never came here for help when setting up Gentoo the first time.
I only come here now to help people that use a distro like Mandrake or Suse that has a lot of problems and is without forums or good docs.