I've done it. The bearing and hub come as one unit. It's about $60-80 if I
remember correctly. It's pretty straitforward, I've done it on my Max once,
and on my sister's 97 Acura TL twice. The only problem on the TL was that
the inner race of the bearing got stuck on the shaft, and I had to cut it
with Dremel to get it off.

Get a new nut and a cotter pin, if you can. You will need a 22mm socket, I
think. Something to pry off the dust cap (I used an old screwdriver). Also,
when you tap it back on, don't hit it on the top - you will bend it. Use a
large socket instead, and tap it with a rubber mallet. I'd put some grease
on the shaft, but that's optional - what's the chance you will have to do it
again?