Rear wheel bearing

see pics, tool might be rented at auto parts. once axle is out have autoparts replace bearing as it needs to be pressed on. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

I intend on replacing some bad wheel bearings in the front of my 2003 Xterra SE 2WD. Do i need to replace both the inner and outer bearings or can i just change the ones that have gone bad and repack the others?

I would never change just one. Metal chips have gone through everything..

Don't cheap out. Do the job the way a conscientious mechanic would do it if he was looking out for your best interest. Replace both bearings and both races. The parts are not very expensive.