Drain diff fluid, jack up the side you are working on, remove wheel, undo the brake line from the drum, remove the parking brake cable(I would remove the cable from the little T mechanism up in the front and all the mounts and pull the whole thing with the axle shaft) , remove the four bolts that hold the drum to the axle housing, slide the axle straight out. Pull the seal , clean everything up, install new seal. This seal is the one that is right there in your face in the axle housing not on the shaft. I cant remember where the inner seal is. Put the axle straight back in, dont let it rub or rest on the new seal and button it all back up and bleed the brakes. Do all four just so you have new fluid in the whole system. Refill the diff with new fluid. I would assume a newbie could be done in a long afternoon. There are no clips in the diff or anything. Triple insano check that you torqued the four bolts that hold the axle the the housing back down. I am going from memory but I am pretty sure you dont have to take anything apart in the drums if you take the parking brake cable apart up front. That bearing is a total [censored] to get replaced. It has the crazy pressed on thingy that has to be cut off. I wouldnt worry about the bearing unless its making noise. If it is take it to a good driveline shop and let them take care of it.
John