I delayed installing because I was planning to do it alone, and it sounded like that might be hard, my default plan was to lay the door down over the window as they advise for larger windows. However, it took me about 20 minutes to set up and free up the caulking on the original window using a utility knife and small chisel, remove all but one screw in the inside, then made sure everything was loose and holding the window from the outside, unscrewed the final screw and easily pulled out the old ...