Bobbi- The way a sailboat sails into the wind is by making turns against that wind in a zig zag. Learn from each experience. Don't be afraid to learn. Everyone bombs... the professional gets back up there and tries something new until it works. Design an act that frees your hands so you can adjust the mike before you get tied up with a puppet. Request a "clutch stand" which is stand that raises or lowers with one hand. Use a wireless mic. There are more solutions than problems always. Don't look to the fear look to the experience. If you make a duck call duck come to you, if you call for fear, fear will come. Start seeing the show not as a fearful challenge but a very unique opportunity to express and experience.
Art is invisible... showing everyone you are a great artist is only showing technique. It is what an artist does with that technique that makes art. Keep working on ways that make your art more expressive.