Several things to think about: 1) don't practice the material until you get it right -- practice it until you CAN'T get it wrong! 2) an audition is just another playing opportunity. We suffer the most from nerves when we start placing way too much importance on any audition. Sure, if we don't pass the audition we don't get the gig, but worrying about that and obsessing about that won't help, and it surely does a lot to hinder our success. 3) don't play "guess what's on their minds" when you walk into the audition room, whether it's an auditorium or a small classroom. There's no way you can tell what they're listening for or looking for -- you just have to be yourself, play the best you always do, relax about things. Your passing the audition is completely out of your control, so forget about it and just PLAY YOUR MUSIC. If they like what they hear, no matter how poorly you might play, you pass the audition. If the don't like what they hear, no matter how perfectly you might play, you don't get the audition. It isn't fair, it's just a fact of life. So forget about it and relax -- the sun will still come up the next day (unless you take the audition on Dec. 20, 2012, if you believe all this hoo-hah about the Mayan calendar), you'll still get to go out to dinner the evening after the audition, your sweetheart will still love you, they won't take your trumpet away and ban you from music forever. It's just another thing to do that day, so go do it and have fun doing it.