Hello, I'm currently a senior in high school. I'm going to college next fall with the intent of getting my music ED degree and attempting to get my masters in trumpet performance and my D.M.A. so I can teach trumpet on the college level. I've made All-State band this year, and several district bands in high school. My problem is, most of the time, I'm self teaching. I pick up things if directors say them to me, but I've spent a lot of hours watching instructional YouTube videos, reading about the subject, spending time sight reading in Arban's, etc. This past year; however, I seem to be hitting a wall. I don't feel like I'm improving at all. My range goes in and out from a high G to a D on a weekly basis, my articulation is still spotty, making music ABSOLUTELY perfect is still a massive challenge. I know that I would be improving a lot more if I had private lessons, but I don't want to wait another 6 months to get to my University to improve. Are there any good books out there? Maybe a change in how I'm looking at my practicing? Any basics I should go back to to improve myself as a whole?