In a way Cricfan is right too.
Learning by doing is also a way, but one may make and be prone to more mistakes here. Again, mistakes maketh a man perfect. A self-made man has more sustaining power than a spoon-fed man.
But then again ART is all about GURU-SHISHYA parampara. So, being groomed by a music director may be an option too.
There are plus and minuses in both the models.
In highly technical fields you don't learn from making technical mistakes. You learn from someone pointing out your technical mistakes. I'll give you an example, when Saurav Ganguly was repeatedly getting out to balls outside off-stump some years ago he sought help from Sunil Gavaskar who explained to him what his technical mistake was. Had that not been pointed out to him he wouldn't have been able to fix it. I've read books by highly technical people who state that making mistakes --technical become a habbit unless they are pointed out and corrected with constant practice and even more technical advice.