I agree with Tristan, Fedora isn't for the faint hearted.
I managed to get my Linksys WMP54G card working, with WPA, on FC4 but only after a few evenings of hair pulling! (had to use NDISWrapper and WPAsupplicant)
There are lots of good 'how-to's on the dedicated Fedora forums at
http://www.fedoraforum.org/ - worth visiting if you are going to stick with FC4.