An ongoing battle

Once you have identified all the trespassers and their entry points as well as sealed up any ductwork leaks. (duct tape duh!) Fixed displaced insulation and made sure the exposed electrical isn't rat gnawed now is the time to get out, take a break and think about your next step. It should be obvious if you've been thorough in your inspection. Something is going to strike you as needing immediate attention and since you took good notes you won't forget anything. First and foremost you want to address any immmediate threats to the home. (again duh!)