Summarize the following:
Tactical breathing is used in the military to calm combatants. It's highly effective at calming your body when it's in an anxious state. Practice tactical breathing a little every day, even when you are calm, so that you will already know how to do it when you are nervous.  Breathe in through your nose for a slow 4-count. Hold your breath for a slow 4-count. Breathe out through your mouth for a slow 4-count. Hold your breath for a slow 4-count. Repeat this process four times. Many people find that their hands do not shake if they clench a different muscle. Try clenching your buttocks or your thigh muscles. Your audience won't be able to tell, and it just might stop your shaky hands or any other shaky body part. You may have noticed yourself pressing on your temples or rubbing your hands when you're stressed. You do this because it stimulates nearby bundles of nerves and releases cortisol, which can help calm your nervous system. To subtly release some relaxation onstage, press some fingers into the fleshy part of your hand between your fingers and thumb. You can do this behind your back, or behind a podium while you speak. If you shake from anxiety, a therapist may be able to help you find ways to lessen your symptoms. If your shaking is changing and becoming worse, let your doctor know. Your doctor may also refer you to a therapist who can help you come up with a long-term plan for dealing with your anxiety. While anxiety can cause tremors, it's also possible that another condition is contributing to your shaking. Your doctor can help you investigate the possibility of an underlying condition.

Summary:
Practice tactical breathing. Clench your posterior muscles. Subtly push on a pressure point. Consider seeing a doctor.