SC, here is a good site with lots of info if you look around enough, and thes page on thier site you can find shops in your area (or close)
http://www.worlduph.com/selectstate.html

I'm contemplating doing this myself also.. but over the winter next winter. Also, here is a great site for parts, or anything vert related:
http://www.convertibleparts.com/
Fast service, got my catalog in two days!

Anyway, do your homework, and you'll then know if you want to and or have the time to do it yourself.

Good luck - Brett - 67 Drop Top 455!