Interview nerves, what actually helps? after 6 years as a teaching assistant

It has been 7 months since my last interview and I feel rusty. I have practised answers but they sound stiff. 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 last year, and it got easier once I kept a simple log of every call and form.