How to dress, according to the book: Robert Bloch wrote, "Lila turned to stare at the fat, shapeless figure, half-concealed by the tight dress which had been pulled down incongruously to cover the garments beneath. She stared up at the shrouding shawl, and at the white, painted, simpering face beneath it. She stared at the garishly reddened lips, watched them part in a convulsive grimace. 'I am Norma Bates,' said the high, shrill voice. And then there was the hand coming out, the hand that held the knife, and the feet were mincing down the stairs."
How to act: Bear in mind that the killer in Psycho is Norman Bates dressed up as his mother, Norma Bates. You're a violent, schizophrenic, cold-blooded killer. That should be enough for you.