Juggler wrote a good tip on how to 'masks' nervous mannerisms so well that when you do get nervous again, you'll be so confident that your masking them so well, that'll make you get more naturally confident. I do it and it's actually helped more than I had originally thought it would
Confus, that stuff happens to me even when I am by myself drinking a cup of water or can of pepsi, my hands shiver and
sometimes it can be misinterpreted anothe way by other less
discerning people