Hub, you are right. Flying the plane over and over will make you better, but reading a thing or two first, and then trying them out, helps a lot. You might fly for a year and get really good, but then somebody says "kick in flaps at the top of a loop, they'll flip your nose over much faster", and while you COULD have done that on your own, and may have eventually found out, if somebody lets you in on the "secret" you learn that much faster.
Just an example.
I try not to get stuck in the same plane(s) all the time. I try to fly various makes and models. That way I learn what works in different planes and try to apply it to similar flying planes. Example: The C205 flies a lot easier if you fly a 109 for a while before trying the C205. And, believe it or not (I'm guessing NOT) I find that flying a 190A is a lot like flying the Ki84. Sure it turns better but is has some similar qualities.