These tips could be applied to many aspects of life I think.
1. Teach with candor. Be frank and honest about yourself and share your experiences, even if that experience is nervousness. Most people can already tell how you are feeling by observing you. If the nervous teacher comes right out and says “Well, ok, I’m feeling nervous but…” they’ll make a connection with people who can identify with that feeling (which is most people) and they’ll dispay confidence for being able to admit it.
2. When you’re sure all of your students are adept(and keep checking anyway!) with a certain flow of practice, a warm up if you will, teach with unrelenting focus and energy. Don’t let them, or you, slip off into some tangent. This is to get everyone established in the streaming focus that is the paradigm of many yoga practices. Speak rhythmically, directly, and concisely with a encouraging power in your voice. Keep coming back to the same points. In my case it’s usually, bandha, ujjayi breathing, and describing the sensations of deep, empowering breath.
3. Lighten up! Let the play begin. Teach more casually and be open to make humorous comments or observations. Begin to teach more rather than conduct like in #2. This means be aware of the skills of the people in the room and work on what you can help them achieve or create. Break things down, give more time for detailed demonstrations, even using the students as models for one another while you do an adjustment to show how to align one’s body in a particular Asana.
4. Keep a good pace until the end and then let everything drop into relaxation. Slow down your voice and lower it’s pitch. Give enough time for relaxation. Savasana should be proportionate to the amount of work and time you spent working. In a light or short class 5-7 minutes is adequate. After a long or challenging class, up to 10 minutes. Savasana should not be too long, otherwise the nerves will become dulled. It should not be too short or the body will not be refreshed or adapt to the structural changes from the practice.