My advice is this: whoever is docking, the other passenger(s) should wait quietly with the rope - and I emphasize quietly - and just let the captain do his/her thing. Nothing like a spouse (or friend, child, etc.) shouting out warnings to stress you out as your learning to dock. Also, you will often dock perfectly when no one is looking but, for now, will almost never dock well if somone is on the dock watching you.
