The gas tank is held on by two brackets and six bolts. It's fairly easy to drop but disconnecting all of the line tank lines is a pain. Like Dub said, avoid smoking.
Before dropping the gas tank, I would pull the fuel filter and have a friend turn the ign. while you have the fuel line aimed toward a bucket or something. Then you'll be absolutely sure the pump is out and it's not a plugged line closer to the engine.