First off congrats! Second, find out if you can get the horn that you will be using adjusted by a pro, for your hands. Bari's blow over a lot of ills. You want a horn that works well.If the thumbrest is hard to reach, Oleg has a real nice thumbrest that is made for smaller hands to reach. On a lot of horns, it's just a matter of screwing it on. Also this is the best practice in the world for your tone. Every other horn sounds better after you've played bari for a while!