Its not too hard for a shadetree. I've had mine off twice, and the tank was mostly full both times. Worst part of the job for me was getting the rubber hoses disconnected from the fuel pump. Just jack the car up or put it on ramps, loosen the exhaust pipe in a few places so it can move a little for clearance, remove the tank straps, lower the tank, and disconnect the hoses. Its better to have two people.
Oh, and the second time i had to drop the tank, it was because i didn't have the strainer fully secured on the pump and it fell off the pump some months later. Be sure it'* tightly secured!