I am a high school trumpet player (Sophomore) and lately i've been having a lot of problems with range and endurance. I have reason to believe it has to do with my embouchure (teachers have told me that I don't use enough top lip). I have attached some pictures. Can you tell me what's wrong with it, and how to fix it? It's starting to feel really weird to play. Also, how long will it take to fix, and how hard will it be? I only have a little over two months until I start my concert and jazz band seasons. Also, I can only afford a couple lessons from an instructor. What should I do?