I've had two of my kids with "braces and brass"... one got her degree in performance on French horn and the other is in H.S. on trumpet and just got his braces off before Christmas. They both had to learn to play with less pressure, they both suffered short-term range and endurance problems (moreso with my son on trumpet), but they both started recovering almost immediately after brace removal (they wore them for three years each). In fact, my daughter played in provincial honours band the week after hers were removed. Neither one of the ever aclimatized to shields or guards... the wax was messy and the plastic guard messed their playing up too much so they learned to adapt. They both had the wire braces, top AND bottom and c/w the elastics to adjust jaw alignment.... what I'd call "heavy metal"! If you have to take a 2nd or 3rd position until you adapt... so what? You're still learning music and those parts have to be played too. Once the braces are off you'll be amazed by the change in your appearance. I'd say "Go for it".