I've done a lot of performance stuff in the past, and let me tell you one thing I've learned personally- no matter how nervous you are, it doesn't change anything about who's watching you or listening to you, so why be nervous? They want to see you succeed, they want to watch you do well, and they want to be impressed, so there's no reason to panic and there is every reason to relax and do your best.
I like it a lot- there's plenty of work to do, the people are great, and you can't beat a Disney job!