Interview nerves, what actually helps? - 4 weeks in

I have an interview on Wednesday and my stomach is in knots. I worked as a customer-service rep before this. The role is similar to my old job as a customer-service rep. Any questions to ask at the end?

I record myself on my phone and listen back. The second try is always better than the first.

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