the thing with the you tube vids is there are none of anyone doing a framed window, the 3 sides of the windows are all wide open . with the frame you need to have it cut right before it goes on the inside, i started doing a dry fit on the inside before i took the clear film off. just to make sure it fit right.

after 2 windows its gets easier to do.

and the top i'd leave almost a 1/4 inch from the top of the glass too. maybe a bit less. if your to high to the edge of the glass it just crumples up when you roll the window up.