The weekend fixer-upper in you has always wanted to start the process of replacing those aging windows, but where do you start? Do you take a quick gander over to Home Depot or Lowe’s to take a look at the window offerings or do you start punching out those old window sills? Well, if you are asking these questions, luckily, we are here. The first step in any window replacement or window installation project is to measure the windows. But, you may be asking yourself, how do you measure windows?