Hmmmm I am trying to remember I know there is on screw below the window crank for the wing window and then the two on the door I think like half way up the wing window those should be the only screws holding the wing window in.
If I am not mistaken I think I had to pull the guts out for the window to drop down and then I had to just kinda work the wing window around a bit to get it loosened up, then you drop it down and then pull it back towards the door handle and then pull it back up and then I think you have to twist it a little

sorry I am trying to remember this all from memory since it has been a while since I replaced my wing windows.
It shouldnt hurt any of the rubber at all when you do pull them. I know that I didnt mess up any of my rubber when I pulled mine..... and I was pretty rough on it when I did pull them !!!!
Well any other help that I can remember or any other questions feel free to ask.
Later
Husker