The headliner is all inside the car - no wrapping. But as 500Stroker said, MUCH easier with the glass out. I just did mine with them in, and it was tough to pull out all the wrinkles (but I am the only one that has noticed the ones I couldn't get. I got new front glass from a local (Texas) glass shop. They said the rear wasn't available, but looking around here, I see a few are offering it. I'm sure someone else knows a good spot.