so i recently got this car and needed alot of work as far as the body.
this is how it looks as of today, but wanted to make sure i wasn't doing anything TOO wrong.





when i got the car the passenger door and fender were replaced, i was able to rip bondo off because they did not sand the car to bare metal before hand.
I started with 80 grit to take most of the old paint off, once i got the a point where i could see factory paint or primer I stopped and moved on. washed, dried, and primed with spray can. then wet sanded with 150 grit again. washed dried, look for low and high spots, tried to fix as much as i could. then wet sanded with 400 grit to smooth it all out. This is the same steps I took with my first crx years ago, but maybe you guys can tell if im missing something? i did use a sanding block the whole time unless it was on a curve or hard to reach area. This is going to be my DD and i just want it to look decent... thus why its going to maaco for a single stage.
I feel atleast that its ready for paint, but then again i've only been reading so maybe you painters out there can tell me something.

 

Probably won't look too bad, but you may way to use a guidecoat to look for low spots. Once you get to that fine of a grit, you can't really see them or feel them without one. Basically you mist a cheap black or red spray paint over the paint and block everything again. Where it disappears quickly, you've got a high spot, and visa-versa for the low spots. You may need to apply more primer to get it straighter though. And if you've got like a 12inch block or longer, that would be best. For those tight curves, the edge of the block of a rounded block is really helpful. To check for straightness, if you get a quart of wax and grease remover from an auto paint store you can wipe that on and catch nice reflections to see if you've got waves in the paint or dents you missed. Water works too, but the wax and grease remover stays longer before it evaporates.

Once you're totally satisfied with how straight it is, I would go over it quickly with 600 grit on a block also to smooth it up some more before paint. For the tough to reach spots, a grey scotchbrite helps to smooth it out too.

Good luck!