heating the roof skin helps it come apart insanely easier. I did the first skin I removed in florida, and I got it off with the only damage being to the cowl area by the windshield wipers, which I think happened in transit, not while removing. Number 2 and 3 were in the winter in WA state, and were much more difficult, I ended up cracking both at the A pillars near the top of the windshield. This seems to be the easiest spot to break them IMO. careful work with a heat gun and some patience, and you shouldn't have any problems getting the roof off.
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