Tiger Woods, Larry Bird, Wayne Gretzky, a pitcher just before a game, I would imagine they all have nervous energy. But as you perform, the nervous energy dissipates and you start to relax and you start to do what you do best.
The real beauty of it - key to my life was playing key chords on a banjo. For somebody else it may be a golf club that mom and dad put in their hands or a baseball or ballet lessons. Real gift to give to me and put it in writing.