how to put christmas lights on a big tree outside

Well, you'll need some tall ladders or scaffolding to reach the top branches. Make sure you have enough lights to wrap around the entire tree, and start from the top and work your way down. Remember to secure the lights with zip ties or wire clips to keep them in place. Also, make sure you have an extension cord or generator to plug in the lights, and don't forget to test them before you turn them on. Good luck!