I have purchased one of these tops from EBay and installed it myself on a 99 Boxster a couple years ago. It is a high-quality top as good as any you'll find anywhere.
The install is definitely DIY, and like you, I worked on it myself solely during weekends. There are good instructions on the web.
However, this is not an easy install and if you are ready for a challenge and some adventure, then go for it. I consider myself mechanically adept but I am not a professional mechanic or top installer. The two main challenges I found are: (1) you will need to order tools and materials that you probably don't have to properly complete the job; (2) be prepared to _stretch_ the material with all your strength to get the top to be smooth all around. Ultimately, I couldn't do (2) quite well to my standards and ended up paying a professional shop to help me finish this last part.
FWIW, the shop told me I did a pretty good job. They'd seen much worse from other owners, so I feel some amount of consolation. Good luck!
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