I have just recently picked up the horn after about two years of not playing. I plan to audition and tryout ,again, for the band in the marines. After about two weeks of regular practice, I noticed I have not gotten very far. I still fatigue after about ten minutes of playing. I have decided that I may need an embouchure change. I don't currently have a trainer available to help me out. Any advice on what i can do to better my embouchure. I also am struggling with getting good air speed. Im pretty sure that embouchure and air speed go hand in hand. I have about six months to prepare for an audition.