Five minutes, run the same way every time, so readiness becomes a decision rather than a mood.
Thirty seconds. Where is tension? How rested are you honestly?
Ninety seconds at four in, six out. Settles arousal before the first hand.
One sentence naming how you want to play, not what you want to win.
One rehearsed response to your most likely trigger.
Decide in advance what ends the session. Discipline is easier before pressure.