Your getting into things that are best explained in the factory service manual ~$40 from just about any Mustang parts house. Usually if you just examine the situation long enough you can figure out how to get it apart. The same cannot be said for reinstalling and adjusting the windows. I know this doesn't answer your question, but the path to your answer starts with the service manual.
The service manual is a guide. (not a very good one, but a guide none the less) I just removed mine, first one took a couples hours and lots of language, the second one about 1/3 the time.
The thing about the vent window is you take the nuts off first, then you take the bolts out, from a different hole. You can't get the vent window out with those bolts in. The windows must be unbolted, dropped down into the shell and the beltline take off. Also behind the rubber door plate, there are 2 bolts holding it, you can see one easy but might miss the other one.
Wear a long sleeved shirt as I cut my arms up badly reaching in and out of thoses shells.
The bumpers, you have to take all the chrome bolts and two fender bolts off to get it off, unless you take off the valance and rock gaurd. You're gonna need a socket with extension and maybe a swivel to get to a couple of these. This one is pretty simple if you just look at every place you see an attachment. Don't really need the manual for this one.