Doc,
SDpooled-up is right... one person can do it easilly in 4 hours... just be sure you run the tank down to virtual empty. I did it in my garage, put the left rear on a jack stand and removed the left rear tire (NOT necessary, just made access a little easier). I used a couple of cable ties to release the fuel line connects, one in particular was tough to get fingers on but not too hard to slip a cable tie around, cinch it up to depress the paws holding the connectors.
It would definitly be easier with two people though, you loose a lot of time crawling out from under the truck to get another beer...
Mickey