I freeze in interviews, tips?, procurement assistant here

It has been 6 months since my last interview and I feel rusty. This is my first time dealing with any of this. I want to come across as confident and honest. What calms you down?

Thanks for writing this out. I went through something close to it 6 months ago, and it settled down once I kept a simple log of every call and form.

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