I took trumpet in school (2 years) where the only thing I learned on technique was 'don't puff your cheeks'. I started up again about 8 months ago after 7 years. I've realized that I don't use enough air to play and also through reading these posts that I probably apply too much pressure. If you know anything about the trumpet in mariachi music, you know that it requires lots of wide vibrato (which I do with my jaw) I'm finding that I play with too much tension in my throat & high notes are nearly impossible. Any tips on correcting these bad habits?