Learning how to judge.....

I was just wondering, when a person has never judged before, and they are brand new, got talked into taking the test or apprenticing, asked to judge, then what happens? You go out with the "senior" judge and then what?

I got asked to judge a senior test at the end of summer and now I am seriously regretting saying yes, and I still have to apprentice...

I am going to feel like a complete idiot and probably won't remember anything I have already learned. Everyone will know it is my first time.

Do the major judges LIKE teaching someone to judge?

Freaking out regards - Mary