SageBrush
REJECT Fascism
Most likely a flexible boring bit. Four feet is only two or three studs, depending on your definition of four feet and where you start and end. Even if its three, that means the other two are very close to the openings. As long as insulation isn't involved I wouldn't expect this to be all that difficult.
Yah. You do have to take a little leap of faith that a wire is not tacked on to a stud in your way