I would minimize the damage by fishing the rope independently of the K&T, abandoning the K&T in the walls, and removing every inch of it that was exposed. I would also re-use the bored holes where I could, one rope to a hole.
Don't believe the other trades, there is always a lot of patch work to be done.
Minimize it by cutting your holes behind the baseboard when you can, and re-using the receptacles and switch openings when you can.
