If you have problems with nerves, and lots of players do - as Squishy calls it, "panicking" - I have discovered after some time that it is helpful to think of some other activity you've mastered that requires smooth and fine motor control.
For me, that is drawing a perfect figure 8. If I notice I'm getting tense - and quite possibly made a panicky screw-up - I visualize drawing perfect figure 8s and what that feels like to my hands/fingers, and they calm right down. The inputs we want aren't jerky; they're smooooth, just like your play and rotation should be. If you never practiced any art/penmanship, maybe there's something else that will work for you.
If you are a newer player, focus