I'm scared

I finally have a job for summer...or almost. I have a trial at the County (my local) tonight, actually in one hour 6 minutes, and like everything else new to me, I'm stressing out. I've never worked in a bar before, and I'm already worrying about every possible thing that could go wrong. I'm quite clumsy, and get confused realllly easily so I just don't think this is the job for me. Oh god. Help me.