Another task before the goal of passing NY state inspection is the headliner. This has to go in before the windshield and rear glass.
I researched how most people install headliners and ended up using lots of small metal binder clips to keep the vinyl stretched and hold while the glue dries.
The headliner I purchased (TMI I think) came with a sound deadener/insulation pad and also bought the headliner glue. I was worried it would be a huge mess and end up loose and full of wrinkles but it turned out fine.
The key was to use lots of clips to hold it and stretch evenly and carefully.
I started by placing the bows in the car to make sure they are in the right order. Then sprayed adhesive on the mesh side of the insulation and on the roof underside. This holds it in place while installing the liner. Once tacky, pressed the insulation onto the roof underside, making sure nothing hangs down. Fatmat would probably have been nicer but I didnt have room in the budget.
I recommend screwing in the visor, mirror, and coat hook screws in now, before the liner, because it will be really hard to find the holes once the liner goes in.
Next I slid bows into the liner pockets and trimmed the excess pocket material since it would make the sides too bulky.
Installing the liner starts from the back. I hooked the rear most bow into the holes and made sure the liner was centered. This was followed by the wire hooks that hold the rearmost bow to the rear roof frame. These are really important to hold the bows as you pull from the front. The wire hooks pierce the vinyl pocket and clip onto rear the bow.
Next, I hooked in the remaining bows and pushed each of the bows up into place.
After that, the stretching starts from the front center, working out to the sides and placing clips as i go. Just make it very snug but not so tight as to pull the clips off or tearing stitches. Next is stretching from the back center outward then each of the sides.
It may be necessary to carefully snip excess material as you pull around the curves of the A pillars and window frames. Look for loose spots and wrinkles and adjust at clips as you go.
Once stretched, the gluing starts. Again from the front center, remove clips and spread glue on back of liner where it meets the frame and also apply to window frame. Slather it on consistently and allow it to get a little tacky for a few minutes before stretching and clipping again, it will bond immediately. I repeated on the back and sides and let it dry with clips in place and left clips on until the windshield and rear glass went in.
Be careful to stretch and snip as you gradually pull the liner tight around the A pillars and curves to make things neat and wrinkle free. This and the quarter vent area were the hard parts.
I highly recommend watching videos and reading further.