It's quite easy to put lights on a fake Christmas tree, actually! The first step is to determine where you want the lights to be placed. You can either hang them from the branches, wrap them around the trunk, or both. Once you've decided on the placement, take the lights and begin wrapping them around the branches or the trunk. Be sure to make sure the lights are evenly distributed and not too close together or they may become tangled. If you're using a corded light set, be sure to plug it in before you begin wrapping it around the tree so you can ensure it's working properly.