My high school has a winter concert coming up and I'm playing lead, one one of the songs the lead part is written for coronet. I went out and rented a student horn that I'm practicing with, and I notice that when I do some warm ups on each horn I'll be just fine, but I miss some notes just switching and trying to play the same piece. Will practicing switching help me? The concert is in a week. I think the main thing is that I have a lead mouthpiece (Bobby Shew E14 marcienkiewicz) and the coronet came with a "Vincent Bach 6" which is a little deeper, and just different. Thanks.