Sure, let me teach you. The first step is to gather your supplies, which will include a set of Christmas lights, some tape or hooks, and a ladder if necessary. Once you have everything you need, you can begin by measuring the length of your windows and deciding how many strands of lights you'll need to cover them. Then, you'll want to use the tape or hooks to secure the lights to the windows, making sure to position them evenly and keep the strands straight. Finally, plug in the lights and enjoy the festive atmosphere!