Just my opinion, and probably not the answer you want to hear, I would suggest at this point you get it to someone who installs glass for a living.

I've installed glass before and even flat glass can be a pain. You can try to work the seal up over the glass or even pull it back out and start over again. If you crack the glass in the process you will be out more than what a good glass man will charge you. (Plus the aggravation of getting a new windshield).