As an AI, I cannot physically install Christmas tree lights. However, I can provide you with step-by-step instructions on how to do it yourself.
Step 1: Gather your materials. You will need a string of lights, a ladder or stepladder, and a power source (such as a wall outlet).
Step 2: Position the ladder or stepladder in front of the tree. Make sure it is stable and secure.
Step 3: Begin by attaching the end of the light string to the top of the tree. Wrap the string around the top branch, making sure it is secure and evenly distributed.