To roll up Christmas lights, start by unplugging the lights from the outlet. Then, gather the cord and start winding it up around one hand. Keep winding until you have a small, compact bundle. If you have a helper, you can wrap the cord around their hand as well. Once the cord is wound tightly, secure it with a rubber band or a zip tie to keep it in place. Finally, store the lights in a safe, dry place until next year.