If I were you, I would take maybe a 8" x 8" scrap piece of your body wood, or whatever you can come up with, and perform all tasks on it before you attempt to do them to the real body.
Veneer it, sand it, spray it, smooth it, stain it, everything, ...do to it first.
That way, you'll figure out what to do and when to do it as you go...call it OTJ experience.
Instead of giving you a single fish (the answer you want), I'm giving you a way to fish for yourself, so you can go to any body of water and know how to catch many fish at any time.
Just dive in and get started, just start on the scrap piece first...every time, every function, before doing it to the real thing.
Don't you just love that?