Having furniture out of the way would be a good starting point. You’d want to make sure that nothing’s in the way of the window frame. No plants, no muddy areas. In terms of the person installing them, you’d want to make sure that they’re with a certified contractor. That’s your best bet to make sure there’s no installation errors. Anlin requires all installers to take a class with them to better understand how to handle and install their special products in order to prevent any installation errors.