The men who cut up the tree should be capable of doing that without getting zapped by the downed wire. That is a reasonable expectation. Just tell them what you know about the wire - that the electric company turned it off at the pole but that’s all you know. They should know what that means.
You can get multiple bids on removing the tree but you have to pay up front and then the insurance company will give you what they want to give you when you submit your receipt. Make out a damage claim right away. The walnut wood might be worth something to whoever you hire or to someone who wants to come and get it.
It’s a major pain. Sorry you have to deal with this.
Have cash if you see a Power truck.