I have had several discussions with people who lecture. Some of them advise staring at people during your presentation and some prefer to make no visual contact. My choice is to make eye contact with the persons in the room. Let the tremor in your voice come in and go out. Everybody's voice will show some tremors from time to time.
Tremors are unavoidable.
Whenever they happen, change to a slower pace, breathe more deeply, and let the tremor go away by itself. You cannot be standing up and sitting down at the same time. By the same token, you cannot be moving and freezing at the same time. Make your point. They are there to learn, so let your audience learn something from you.