My wife has just started teaching a kid of about 8 to play the trombone. As he's left-handed he assembled the trombone "back to front" ie bell piece over right shoulder, slide in left hand. On the face of it this seems fine, but as I'm only a cornet player (and my wife euph) I thought I'd ask if there are likely to be any problems doing this? If not, should we perhaps encourage left-handed people to play the trombone, as it must be the only brass instrument that can be set up for both right and left-hand use without major plumbing alterations! I know left handed people "manage" to play right-handed instruments, but maybe an instrument that can easily be made left-handed properly is better?