Hey OzDJ,
Congrats on getting an interview.
When I went for my driving test, I was soooo nervous. My own worst enemy, constantly worrying about everything, and working myself up and making myself nervous. I was fine with the actual driving, I just couldn't hack the thought of being 'rejected' (failing the test) and because I was in the frame of mind, I made my fear come true. So, the next time around, I had talked it over with my friend. She would ask me "if such and such happens, what will you do?" We asked the testing centre where were the likely places I would have to go, and we drove those routes till I knew them really well.
My point? If you are prepared and have gone through all the possible scenarios in your head, you'll feel less nervous because you have already faced that particular 'fear'.
Sorry if I sound preachy but it really worked for me - I passed no worries, it was all my frame of mind. I just thought "I will pass, I will pass", not blindly but because I was prepared for what might happen.
Also, a naturopath friend of mine told me about "Rescue Remedy" - a natural mix of Bach flower remedy that you put a couple drops under the tongue before a stressful situation. It helped calm me down and I was able to concentrate on what I was doing and didn't feel half so nervous.
Best of luck!
Sky
PS - two weeks ago I went for a job interview (not for airline but an airline-style group interview) I did really well because of what everyone else has posted on Pprune about interviews - I knew exactly what to expect and felt so confident about the situation, whereas other girls, on getting out of the lift and seeing thrity people, just about died. So, mentally preparing yourself really helps!!!!