Why go to all that work when it is already wired into the breaker Panel of the House?!
Just shut off the items you do not need at the Breaker Panel...
That would depend on the type of generator, I am guessing. Mine does not get wired into the house, what ever I want to run while the power is out has to be plugged into it. My pump gets plugged in at the well house, I was assuming he had a newer well that would be wired to the box. I am not an electrician so I am sure there are better ways to do it.