Interview nerves, what actually helps? after 7 years as a call-centre agent

It has been 13 months since my last interview and I feel rusty. I am in Buffalo, in case local advice matters. I want to come across as confident and honest. What calms you down?

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

Thanks for writing this out. I went through something close to it 13 months ago, and it settled down once I kept a simple log of every call and form.