Boy was window installation a joy. Here was my technique-follow at your own risk:
Rear glass- dropped the bottom into the gasket and the rest went in with relative ease. Maybe because our roofs have some give in the back.
Front glass- tried dropping the bottom in and working the gasket around the rest. Ended up cracking the glass when getting the last of the top in! Pulled it out and started over with the top in first. The bottom was then relatively easy, pushing the gasket under the glass from inside the car.
Going to get the crack repaired and live with it till I can afford a new one.
Here is a photo of my homemade tools for the chrome locking strip. I made the one on the bottom first and it was a bear to get the strips in. I then temporarily lost the tool (it was hanging up behind the wheel nut wrench!), so made the other. I dont know if its the tool or I got better at it, but this one worked well - taking about 15 minutes to get one strip in. I'd hold this tool in one hand, at about 20-30 degree angle from vertical, and wiggle/rotate it back and forth as I kind of pushed it with my other hand's wrist, whose thumb would be down between the tool V pushing the strip down behind the tool. Lots of soapy water of course. I ended up electrical taping a piece of rubber on the thumb and then covering it in two pair of glove for the pain!
link to my rear screen fitting problems:
lotus-chassis-f36/fhc-rear-glass-gasket-fit-question-t29250.html#p194115