To properly decorate a Christmas tree with lights, you should start by hanging the lights on the top of the tree and then working your way down. Here are some tips for decorating a Christmas tree with lights: 1. Use a sturdy ladder or step stool to reach the top of the tree. Make sure the lights are evenly distributed around the tree, and use extra clips or ties to secure them if necessary. 2. Start by hanging the lights around the base of the tree and work your way up. 3. Make sure you have enough lights to cover the entire tree.