Congrats on the fuel pump! Sounds like dad owes you some parts!
Hit the bumper bolts with some penetrating oil before you try and break them loose, I'd the bumper is original it'll be a 3/4" socket and wrench to get them off. The bed side is I believe, 1/2" and there are a bunch of bolts, and a spot weld at the back.
Keep wrenching on your own stuff, makes you love your truck that much more!