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

I get tongue-tied when I am asked about my weaknesses. Any experience at all would help. I have practised answers but they sound stiff. What calms you down?

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

Thanks for writing this out. I went through something close to it 10 months ago, and it got easier once I kept a simple log of every call and form.