I have an interview coming up and want to be extra prepared
Make sure you dress nicely and bring a positive attitude.  
Thats good advice - thanks!
Yeah no problem.  Make sure to do a mock interview with a friend or family member to practice what you will say.
I will. I want to do everything possible.
Is this your first job?
No. I've been working for 21 years, but this is one I actually want!
What's wrong with the job you have now since you have been there for 21 years?  Must not be too bad.