Clean the windows film very well using detergent and water mix and lint-free kitchen towels. This step is very important, make sure you get dust from all the smears and dirt and windows and then make sure that it does not leave any smears left. Once you make sure your window is clean, spray the spray bottle slightly for the good smell of hot water on the window.
You do not need to enjoy the window, just spray it lightly. The next step is peeling to support the window film. The easiest way to do this is to catch the film in one corner and seize it. This is the place where someone is easy to help you because you can catch that film when you take a backing.