Interview at Mc Alisters Deli, what to expect?

I completed the first interview, the manager told me they have a three part interview process, and I was asked back for the second one. Has anybody done this?? What will interviews 2&3 be like? This is my first job, and I am a nervous newb, so any info would be super helpful! I'm so scared of answering questions wrong, or going blank in my head. Ooo and I don't act like a scared mouse at the interview, I 'act' confident, but I'm so anxious inside.