The best advice I can give you is to either take it to a glass shop and have them do it or bribe a glass installer to come to your home and have him do it. Offer to give him Hydraulic Sandwiches (12 pack). It's the easiest, and will result in the least amount of problems.
If you insist that you need to do it yourself, use the rope trick - and in addition use talcum powder sprinkled generously on/in the rubber. It will act like a lubricant, helping you get the window in. Cross the rope at the center bottom of the windsheild. This will get the hardest part in first, the bottom. As you progress around the windsheild, it will finish at the top/center. Top /center is a lot easier to get your fingers at than bottom/center, especially when you are struggling with a window. You have also set all of the weight of the window into the bottom of the frame at the beginning, freeing up you hands and back to struggle with the rubber seal at the top of the frame.
