Not only is it very easy to apply this type of window film, but it is also re-usable. This makes it great to use for seasonal occasions if you desire. To take the film off a window you just take hold of one corner and peel the film back gently. If you want to keep it, it is recommended that you put the film back on the same backing paper that came with it when you bought it.
While you can put the film on a window, or a door, by yourself I would recommend that you have someone help you especially if you have a fairly large expanse of area to cover. Even if you are just doing one window, you still may find it easier to have someone help you at least while you’re peeling the backing off, as that is a bit tricky to do by yourself.
Static cling window film is readily available online in a variety of different patterns and colors.