I had my window tints installed by an experienced installer independently recommended to me. I am very happy with the result.
IIRC the door windows on both sides of the Insight curve inwards both horizontally and vertically - meaning that the tint has to be placed on a convex surface. The installer carefully heat shrunk the film just enough to get a tight fit on the window. I would not try that at home
He also trimmed the film to stop about 1mm before the edge of the glass to stop the edge of the film "catching" when the window closed.
I think it is unlikely that you will get a good result doing it yourself.