A rhinoplasty is unlikely to cause a noticeable airway obstruction, which of course would be very bad. When you are phonating, very little air comes out your nose, so that's not a problem, but of course you want to use your nose to inhale after surgery as you do before.Certain noses are more likely to result in a change of airway openness than other noses. You need to see a surgeon who can appreciate what might happen and CARES about what might happen to you. Go slowly, tread carefully. Make the surgeon prove that he knows and cares. It would be a disaster to be in the office of a surgeon who sees you as another item on an assembly line, or in the office of a surgeon who is not truly expert at rhinoplasty. You don't want to be looking for a revision.Also, changing the nasal cavity can make a subtle change in the resonance cavities of your head, changing in a very subtle way what your voice sounds like, which change you might notice. That's another thing to think about, too.And finally, if your opera singing is mostly avocational, and you hate your nose, that would lean you toward proceeding. But if you know you'll be deeply involved for the next 40 years in opera, and you're just noticing the bump, that should move you away from having surgery.Hope these thoughts help.