[lilpoindexter]

Suck out as much fluid as you can with a turkey baster or mityvac, so you don't stain your driveway (as much).
Get you some flare wrenches, and disconnect the threaded fitting at the pump
Disconnect the return line, probably held on with a hose clamp.
Find the thingy (power steering pump, alternator, smog pump, etc) that moves to adjust belt tension on the belt on the ps pump - loosen that thing to remove belt tension. Take off the belt.
Find the bolts that hold the ps pump in place. remove them. pull them off, remove the pump. You will spill fluid all over the floor and your clothes.
Most pumps don't come with the pulley, so you will need a pulley tool. They sell a cheap one at harbor freight...if you use it...it will work, but it feels like a frustrating, cheap made in china tool - because it is. You will use the same tool to put your old pulley on the new pump.
Reverse all your other steps, and BAM new PS pump.
To bleed it, jack up the front of the truck, and turn the wheel back and forth a million times until you see no bubbles in the reservoir. Top off the fluid to the correct cold level, reverify again when hot, at the hot mark.

OH...you will probably want to flush the system before you put the new pump on, just to get the crud out.