Interview nerves, what actually helps? - what worked for you?

I have an interview on Tuesday and my stomach is in knots. I am in Toledo, in case local advice matters. I want to come across as confident and honest. How do you prepare answers?

Arrive early, drink water and take a slow breath before you walk in. It sounds simple but it helps.

Prepare three stories with a clear beginning, action and result, and adapt them to the questions.