Taking the top off then putting same one back on

[patssle]

I have a tear in my window and am pondering the decision of taking the top off myself and having a new window sewn in or having the shop do it. It's a $750 vs. $150 decision. I've read several of the different how-to's and it looks to be an annoying job - plus I'm hardly crafty when it comes to fabric.

Aside from the adhesive tape - do I really need any new parts as these guides are saying (but for a completely new top) or will utilizing the same top let me use the existing parts (such as the sliders?). What should I buy before I do this project so I'm not stuck with a top I can't put back on?