It's easy. The only extra step is to wet the window before applying the film. More water makes adjusting the fit easier. I used Amazonas crate pieces as a mop to squeeze the water out the sides. The only "caught" - do not dust the film and window during installation. Each speck of dust reveals a small bubble on the other side of the window. It's probably easier at home, but I put it in the garage. No flaw of the film, just the nature of the beast. While it's still damp, you can simply peel off the corner, remove the stain, and reattach.
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