Trying to be serious for a moment, a chainsaw is definitely one of those tools I would
not use without training and the proper PPE to go with it as I rather like having my limbs attached and blood on the inside.
If you are doing branch trimming I guess you have these sort of things in the USA:
550W Alligator® Powered Lopper
www.blackanddecker.co.uk
But obviously you have to be able to safely access the region of the tree around the pole top so you can wield it without the risk of falling off a ladder and/or chopping one of the utility cables by mistake. Cutting back the branches is the best option as trying to move the support wire is only a short-term solution.
But really if the utility will do it for free (or small fee) get them in - don't take unnecessary risks.