Here''s an entirely-explicit set of instructions for you. If you enter this exactly as-is at a terminal and have the correct utilities installed (see "What do I need to install GARNOME?"), it should work.
cd /tmpwget http://www.gnome.org/~jdub/garnome/download/garnome-0.27.1.tar.bz2bunzip garnome-0.27.1.tar.bz2tar xvf garnome-0.27.1.tarcd garnome-0.27.1cd meta/gnome-desktopmake install
And then you wait a while for it to download and build all of the pieces of Gnome. Feel free to replace /tmp with something else, I just needed to pick a directory I was sure you had and could access as any user.