Everything you need is given above I add my bit that works for me

Practice till your hands do it automatically and your mouth opens and the words come out. Practice so much that you dont need to engage the brain autopilot will do it.
Nerves affect us all and a little nervous tension prepares the body for action but keep it in perspective
Start your performance with stuff you know well you will settle into it better
Made a mistake so what get on with it
Beer in very small amounts but otherwise no
Enjoy it

Fantum