Fuel Tank removal Help and questions

[snacob14]

Just have a few questions about tank removal. I have an 87 short bed 2wd. One has a bad sender, and the other is leaking. I"m replacing the leaking side tank which is on the drivers side.

Whats the process, I wish I had the time to lay under it and figure it out, but with a new baby and a job I'm really on a time crunch. I see the bolts on the inside of the frame. Will those loosen up the cradles that hold the tank in? I really just want to drop it and replace it.

Also, my gauge jumps all over the place. It reads, but it will bounce back and forth a quarter of a tank at a time. Is that the sender, or the gauge? Thanks in advance for the help.