Placing Christmas lights on a tree is a delicate task that requires patience and care. It's important to start by assessing the shape and size of your tree, as well as the type of lights you plan to use. For example, if you have a large tree, you may want to consider using longer strings of lights so you don't have to make as many trips around the tree. Once you have your lights, start at the top of the tree and work your way down, taking care not to tangle the lights as you go. It's also important to test the lights as you go to ensure that they're working properly.