I only done (well helped do them) in my old car. I am getting a noise that gets louder and louder the faster I go. From my previous car, know that is the bearing unit. If I replace one, I am replacing both of them (with Timken units). I know the procedure on how I did it on my old car (2001 Chevy Malibu POS), can't be much different from from it (remove axle nut with my 36mm socket, remove three or so bolts holding on the bearin unit, disconnect abs sensor, put in new unit). It isn't too loud yet, so I think I got a few months before I need to do it. With the garage I have access to, shouldn't take too long.
EDIT: Is pirate4x4 working for anyone?