[Christ]

You'll need PB blaster and air tools.

There are 4 bolts holding the leaf springs to the axles, 2 bolts holding the shocks to the axles, and 4 or 8 bolts holding the driveshaft to the axle. The brake line should be 7/16, I think...

When you park the truck the night before, spray all the bolts and the brake line with PB blaster. When you get up in the morning, while you're preparing to do the work, spray them again.

The only downside to swapping the whole axle is that you should have an alignment done afterward. There are nipples on the axle or springs that will fit into holes on the other, so you can't horribly misalign it, but you won't get it exact, either.

Honestly, once you see the work in front of you, you'll see exactly how easily it can be done.