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Every practice in the library, in one list. Narrow it by how long you have, who it is written for, and where you are right now.
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Learn your signs of too high (racing, panicky) and too low (numb, shut down). Aim for the steady middle.
There is a zone where you can feel and still think. Knowing when you are leaving it is half the skill.
Looking for a whole subject rather than a single practice? Start from the nine areas.