if you have the proper tools....it wouldn't be bad at all.
the only thing we didn't have that would have been a big help was a press.
the old bearing is pressed in, and needs to be pressed out. then the new one pressed back in.
if you follow a haynes maunual on the the disassembly of the hub and axle you should be all set.
dont forget the torque wrench, some length of pipe (for leverage), anti-seize.
and becareful with the 18mm bolts that are on the back side of the hub.