I've done just about everything automotive, from full restos, fabrication of ANY component/body panel/engine driveline parts, as well as all phases of body work/paint/glass/engine building/machining/tranny rebuilding/differentials/suspension/etc/etc/etc and upholstery, including convertible top installs...trust me, if you can afford it, let someone else do it, just find a qualified shop that specializes in convertible tops, otherwise if you want a challenge, go for it, just be prepared to purchase another top if you FUBAR it
Mike