The key to making a beautiful Christmas tree with lights is to first plan out the design and layout of the lights. You will need to decide on the number of strands you want to use, the colors and types of lights, and the placement of the lights on the tree. Once you have these decisions made, you can begin by wrapping the lights around the tree in a spiral pattern, starting from the bottom and working your way up. Make sure to evenly space the lights out and overlap them slightly to create a full and even coverage.