If you are going to chuck the ripped top anyway, why not try something like this first?
https://www.youtube.com/watch?v=Dozd_sDlbtc
If that doesn't work and you are replacing the whole assembly, I would probably look for Shipkiller's top motor replacement guide. It shows how to take the whole top apart and off the car- you should be able to use that as a guide. Apparently is not a very easy job, but it is doable. Just search the site for the soft top motor diy threads.
P.S.- have you tried to see if insurance might cover it?
Good luck!
-gc