I did this last year. I had gotten a quote from a reputable upholstry shop of $1200 for a new top and installation. So I bought a top for almost $400 from Cabrio World that looks and feels exactly like my old top. I used the instructions from the CD manual to do this. I also read through the instructions from the World Upholstry site. Not a lot of difference that I remember.
You should do a search on this site, because there was a lot of information just last year. A few things I would say are:
Glueing the top to the rear frame is one of the more critical areas that needs to be done right, or the entire installation won't look right. This particular area is also the only area that requires more than one person. It's not hard to do it right, you just need to make sure you align it carefully. Make sure you do a couple of dry-fits before you actually apply the adhesive. That was probably the best advise from the World Upholstry site.
I used 3M Super Trim Adhesive. Great adhesive, but it's a spray, so it was very difficult to use. If I did it again, I would probably switch to 3M Fast Tack Trim Adhesive. It comes in a tube and that would make it much easier to use. Whatever you use, you want it to setup quickly because once you have it in place, you want it to dry in place.
I spent a lot of time prepping my frame. I removed all of the old adhesive by using adhesive remover and a razor blade. This took a lot of time. I don't think I said that enough, this took a lot of time. I think it took me about two weeks, spending about an hour or two a day on it.
Don't get rid of your old top until you're finished. I don't know how many times I had to go back to my old top to see how a certain area was folded, trimmed, etc. The fabric on the rear bow can't overlap into the groove for the rear seal. If it does, the seal will never get/stay in place. You will almost certainly have to trim the flap. Same for the vertical window flaps.
Don't try to do this with the frame on the car. The rear bow and the front header should be done off the car, as well as the inner bows. I did the vertical window edges on the car.
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino