After all - all hellobee'rs are loved ones right!?

I have an interview with the county I live in. I am super nervous because the last time I Interviewed for a position was when I was 18 years old! This was also for a county job but only as a student worker while in college. That was 9 years ago! My current job didn't give much of an interview - they basically just asked me if I would be comfortable around sex crime type cases and then asked me if I wanted a tour of the office!

So I am freaking out.
What would your #1 tip for an interview be for a loved one if it was their first time interviewing for an adult job?