One pretends to do something, or copy someone or some teacher, until it can be done confidently and easily in what becomes one's own style
Cary Grant...and there I suddenly found my articulate self in a dazzling land of smiling, jostling people wearing and not wearing all sorts of costumes and doing all sorts of clever things. And that's when I knew! What other life could there be but that of an actor?
Cary Grant