Aetna was no picnic to deal with when I went through the process in 2002/3, but I hope they've changed their tune by now. You will have to fill in all the forms, answer all the questions, get all the tests and have your doctor write all the letters, but if your plan covers bariatric surgery you should be able to make the case that banding is preferred for you.
One thing Aetna did well, I thought, was make its requirements very clear. Make sure you read it ALL before you get started; they make their list available on their website so you shouldn't get stuck with any surprises if you are prepared. Your doctor, if he's done any of this before, will also know a lot about what he needs to provide.
Good luck, and try to be patient! I know it's hard, but it's SO worth it in the end. :)
__________________  ~~ Alexandra banded 8/20/03
band removed 4/9/07 due to slippage REbanded 8/13/07 340 highest / 210-ish lowest / 275-ish now / less
5'10" -- size 28/30 then, 18/20 now |