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

I have an interview on Thursday and my stomach is in knots. I worked as an electrician's helper before this. The role is similar to my old job as an electrician's helper. How do you prepare answers?

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

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