How to change rear hub assembly on 2002 Pontiac Grand Am GT?

I have changed the front hub assemblies---all the bearings are bad---but the back looks completely different. The back has disc brakes(not shoes). I had no problem taking off the rotors and the brake calipers, but now I don%26#039;t see what to do next, as they are not the same design as the front. Anyone know anything about the back ones?|||Not enough space to write it here, go to the library and check out the repair manual for this year. Or better yet go to the auto parts store and buy the manual....