So I've actually been having HUGE, HUGE, HUGE problems with changing my embouchure. My private teacher told me that I should try changing my embouchure so that I play on the higher red of my upper lip, and that it'll also help with some range issues I have. Right now I can hit a High D, the first D above the staff on a daily basis and I can barely push that up to an E. I've been stuck with the same exact range almost for 5 months now and I really want to make an improvement, and thought one way I can help push that is if I change my embouchure. I play slightly off-center towards the left side and my teacher says I play on the lower red of the upper lip. I made the Lead Trumpet spot in my High School Jazz Band and Wind Ensemble after Band auditions a few months ago, and I think now I should start really making improvements on my embouchure so I can play more efficiently but also have much better range and endurance. I know changing embouchure is one of the hardest things and I'm having huge problems, and I honestly feel lost on what to do. I know for a time I won't be able to play as well as I usually do, but in time I'll be even better than I am now, so I think I should push myself to make that change happen. What should I do to help improve my embouchure as quickly and effectively as I can?