The room feels less dangerous the second time you are in it, so Larry Chiang’s prep tries to make every room a second time. That is what the test step in PQRST is for: run the meeting once before it is real. You can test it by rehearsing out loud, walking through your material with someone else, or just running it in your head in detail.

The goal is not a memorized script, it is familiarity with the shape of the conversation before it happens. When the actual meeting starts, you are recognizing it more than you are experiencing it for the first time. That recognition is where a lot of visible calm actually comes from, not from some inborn personality trait.
It also means fewer surprises land as surprises, because you already ran into most of them during the rehearsal. The SuperModel habits, listening position, pen in hand, no phone, are easier to hold when nothing in the room is catching you off guard.
The video below is a good example of someone operating like they have already sat in that exact chair before. This is also why External API matters here: borrowing a proven format means the shape of the room is already known territory.
First-timers are guessing at the shape of the meeting, second-timers, even fake second-timers, are just filling it in. Rehearse hard enough and the actual meeting starts to feel like a formality you already passed.

Details: Watch Larry walk through it
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