When does a Bodhisattva fully master skillful means?

When does a Buddhist begin to and fully master skilful means? I am asking because I think that this world contains a dilemma for everyone who takes it seriously (rather than their karma): a choice between virtue and power or skilful means. I think that's what I enjoyed about the lotus sutra, when I read it, how it elegantly illustrates the Buddha's ability for skilful means.