I did not want to do mine myself....I bought a top recommended by my upholstery shop, it was $ 350, so was installation = a total of $700, BUT they also fixed a cracked( welded it) rail and made sure... ( my old top had a rip above head of passenger..) and after I used the top the first time , it ripped in the same place !!....
so, luckily I had warranty , got a new top, they now made add`l adjustments...now I`m very happy...
so if I had done mine myself w the same result...no warranty, just buy a new top..
so my advise would be to not do it yourself , esp. if its your first time...
I have a friend here that did his himself...got a few wrinkles in it and was not happy , he later took it to a professional,it got better but they could not get all wrinkles out...
But I have heard of succesful stories too!
I just felt like not tackling it myself, spend the time and maybe mess it up...
my .02
Bjorn