Would even fully checked-out pilots be carrying around a bindered handbook to pull breakers in the bay below or could a typical Amish do it, given that everything is so well labeled?
HF
You presume correctly about there always being a binder back up.
Anyone can be trained to locate a pull a certain circuit breaker. All you would need is a training manual, not even the actual cockpit. Ex: “Look behind the co-pilots head, third row down, second from the left, labeled such and such”