Hey Jesse. I just pulled all the carpet out of my 89 XTB and as far as the floor carpet, no cutting is needed. The screws that go around the fiberglass under the driver's seat and along the inside of the cockpit can be removed to slightly pry up the fiberglass, and I mean SLIGHTLY! But yeah the carpet goes the whole way up under that fiberglass and I just kinda used a screwdriver, sliding it under the fiberglass to break the carpet loose and then gently pulled it out from under there. where it goes underneath all the fiberglass lips elsewhere it should pull right out. I was actually surprised at how easily it came up. Hopefully you get it out incident free! Let me know how you make out, I'm about to put the new carpet in my XTB, we'll have to compare results!
-Nick