Disconnect front of drive shaft, if you have manual hubs, lock then and remove the 6 nuts that hold each cv to the diff (unlock hubs and turn half way through). If you have auto hubs it'll take 2 wrenches instead of one...
Place floor jack under diff, and remove 3 bolts that hold it in place. Help with this part is a good idea, the diff is heavy. Remove locking hubs, and the bolt in the end of the axle shaft, and or the snap rings that hold the shaft in.
Disconnect the sway bar mounts on the lower A arms. (a good time to toss the whole thing as the front mounts will probably break...) Turn steering wheel left and right as needed to slide the axle shafts out.
Be very careful as this job can require a lot of jacking the truck up and down... Try to do as much as you can with the tires on and it sitting on the ground.