No matter what anyone tells you, do not install the headliner with the windshield/rear installed. It is far easier to put it in and then reinstall the two pieces of glass. Plus, I have seen many headliners pull out that were not stuck behind the glass molding. I'm sure it can be done but I have seen too many poorly installed ones to justify not pulling the glass. With the glasses out you can use my binder clip idea and get the thing looking pretty good without applying any glue. It allows you the time to make sure all the bows are properly position and everything lines up. After you get it in place with 60+ binder clips, apply the glue and you are good to go.