i just replaced my buddys and my rear wheel bearings,i bought a press a few weeks back at harbor freight for $99.99, makes it a lot easier. if you dont have a press you can try thr bang on the ground technique and hope it will but off, make sure you pull the retainer clip. to press it on you can try a pipe over the axle and a bfh, its a beotch but can be done in a pinch.

i also made a tool to hold the axle in the press that bolts to the backing plate from an old 2wd axle tube. i welded 1.5 inch square tube to it so it will fit through the press apron and then slid rotate it 90deg a few pumps and viola naked axle. some shops will do it for you for a decent price after one told me $35 to press each one off and $12 to press them on each axle i said to heck with that and bought my own. now if i can get one of those suckers to pay that much id have a free press less the 30 min labor.