Get some time in a ATC-810, that's where a lot of people have problems. Study the jepp introduction in detail, know what all the little symbols mean... like what does the L mean in VASI-L on the back of the 10-9 chart. Smile, give it your best shot, and enjoy the experience and remember they called you in because they want to hire you.
I was just out at the hangar last week and met three people going to thier interview. Two CFIs and one retired AF fighter pilot.
Scott