65 barracuda headliner install

worst job I ever tried, but I did it and wont do it again. I was told to start from the center and work your way back and forward, but I think your way makes way more sense. Take windows out, they take 15 minutes to pop out, really. You wont break the rear one I promise. There are dragon teeth under the gaskets that the material pulls over and onto. Get the back glued and set and then work forward as described, get a partner and pull taught from side to side, and finally get teh fronts pulled and glued. The rear sail panels are a mystery to me, I put the jute back there but it still looks a little saggy. Can I heat gun it and tighten it up a little or does it make it stretch out? My fingers hurt for a week.