We had an RV place put in our windows (we put in the vents ourselves, purchased them from the rv store) and then we made our own dividers. If you want to put the windows in yourself, I'm sure it's not hard. Our windows had to be special made to fit in between the metal braces in the trailer, no standard windows would fit. So we just took it there and they did the measurements, the windows were a little pricey and they only charged a few bucks to install them so we just had them do it. Our trailer was 12ft.