what year do you have? 04-some 05 have a one piece hub drum.. that you take the nut of and pull everything off the spindle. later models have set screw(i think) that you remove to pull the drum off the spindle.

if you knew that and are still having trouble verify the ebrake isnt on.. then you cam try turning the adjuster back until the drum frees up. you if you are just replacing everything and its really really stuck, tap it off with a hammer to break the ridge on the drum formed by the pads and rust..