Fill the kettle before the room is warm
Cold water goes in first, always — drawn at dawn if you can manage it, and never re-boiled. The kettle sits over the sunken hearth and is left entirely alone. What you are listening for is not a whistle but a change of texture, somewhere between rain on leaves and wind through pines.
This takes roughly eleven minutes. There is nothing to do in those eleven minutes, and that is the first lesson.