I guess by taking lessons early on, and really trying to play all the rudimentary stuff, and try to have it sound as good as my teacher. It took a lot of practice, which I enjoyed, and still do.
That's my main flaw: I always think authority figures or my boss is going to think something I do is funny. And usually they don't.
The real exertion in the case of an opera singer lies not so much in her singing as in her acting of a role, for nearly every modern opera makes great dramatic and physical demands.