Hi, this is not that hard, but a lot of work. First jack rear of truck up and put on jackstands.
2- remove rear wheels
3-put a pan under the rear differencial, oil will come out.
4-you will see a cover on the back of the rear end 8 or ten 13 mm bolts remove these bolts.
5-the cover will prob be stuck on pry off, carefully so you don, t bend cover.
6- now you should have oil running out into the pan let it drain.
7-inside the differencial you will see a 5/8 steel pin spin the gear until you see a 8 mm bolt going through this pin.
8 remove this 8mm bolt pin will fall out
9-now go to the side that has the bad bearing push in on axle you will hear a c lock fall into the pan.
10-now pull axle shaft out.
11 the bearing will have to be pressed off this axle and pressed back on.
Hope this helps if you have more questions write back. Billymac