Darn dirty job, 3 1/2 hours for a Olds Bravada: 1) siphoning gas from tank; 2) jacking up the car; 3) removing the spare tire; 4) unplugging about 1/2 hoses that had confusing fasteners; 5) sliding a floor jack under the tank; 6) removing two screws from the harnesses that secure the tank to the frame; 7) tapping off the securing bracket; 8) removing the piece of $hit Airtex fuel filter; then, aligning the tank under the car on top of a floor jack with a 2x4 and securing it.
The dealer wanted $1500 to perform a 3 1/2 job. If you don't mind getting dirty and investing about 4 hours to do the job yourself to save a bunch of dough, then you can do it.
This is the 2nd time I've done it and it wasn't any easier than the first time, however, I was prepared for the problems I encountered last time, i.e., re-installing the tank back.
Good luck grasshoppers.