Well... we can't know everything when we are new can we... You're not supose to know everything about how to do your job before you begin... that's what the education is for... And I do'nt think they have any complicated matematics in that job (If I remember correctly, you don't like math). Don't worry everyone is going to just as nervous.

Just keep an open mind... And then a tip I seriously considered giving the people at an education I was helping with the other day at work (I sat in the back and saw them all confused about what to do). "The one that asks may seem stupid, but the ones that don't remains stupid."

Good Luck!