I would like to remove my Gnome 2 desktop to replace it with Gnome 3, because I do not want to update to Debian Wheezy. How can I do that?
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I would NOT install every .deb separately - this is a terrible idea and there are much better ways. Plus the guide is quite outdated, although on the right track. You should look, as said in the link, into apt-pinning. But don't use experimental, testing is already on gnome 3.4 and will save you a lot of hassle.
Seems like what you're looking for : http://raphaelhertzog.com/2011/06/16/installing-gnome-3-on-debian-6-0-squeeze-no-sorry/
That blog suggests using Experimental debian repos and fetching Gnome 3 from there
I'm not sure, but chances are you could also get every .deb (including gnome 3 deps... good luck!) one by one from the newer debian releases, then install with dpkg.