It's a simple process. First, you will need to gather some basic supplies. You'll need a roll of thin wire, some lightweight hooks that can be easily attached to the window frame, and of course some Christmas lights. Once you have everything ready, you can start by measuring out how much wire you will need to create a loop around the window frame. Then, you can attach the hooks to the frame and loop the wire through them. Finally, you can hang the Christmas lights on the wire and voila! You have a festive window display.