To hang Christmas lights around a garage door, you'll need a ladder, a staple gun, and some Christmas lights. Start by measuring the height and width of the garage door to determine how many lights you'll need. Then, use the staple gun to attach the lights to the top of the garage door, starting at one corner and working your way around. Be sure to keep the lights close together to ensure even coverage. Finally, plug in the lights and enjoy your festive garage door!