[SOLVED] Changing themes in F17

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http://forums.fedoraforum.org – Yeah I know it's not officially released yet, but it's less than 24hrs away. Anyway, after doing much research, I can't figure out a way to change themes in gnome shell. Is there a fool proof way to do it? Btw, my gnome tweak tool crashes with user theme extension installed. (HowTos)