[ならうよりなれよ, narauyorinareyo](exp) practice makes perfect (implying that it is better to learn from personal experience than from an instructor)[Add to Longdo]
[たざんのいしもってたまをおさむべし, tazannoishimottetamawoosamubeshi](exp) (arch) (proverb) (See 他山の石) one should learn from other's mistakes; stones from other mountains can be used to polish one's own gems[Add to Longdo]