First: evaluate if you can do it safely.
Thinking about doing some DIY and trimming your tree branches yourself? First, evaluate whether or not it's safe for you to do so. Here are some general guidelines:
If you can't reach the branches from the ground, call an arborist. If the branches are within range of utility/power wires, call your electric company and have them do the work.
OK. My branches are <4" in diameter and it's safe to do trim them myself.
When should I trim or prune my trees?
Autumn or winter is a great time to trim or prune because the leaves have fallen off and you can better see some of the branches to be removed.