It takes seven minutes.

A dusting of Clinique Stay-Matte powder in honey. A hand-stitched wig. Eyebrows glued up into tiny peaks. The rest is left to Alec Baldwin: the puckered lips, a studied lumbering gait and a wariness of humanizing a man he reviles.

The transformation of Mr. Baldwin, an outspoken liberal, into the president-elect, Donald J. Trump, for his running parody on NBC’s “Saturday Night Live,” entails a tangerine hairpiece and a tricky tightrope walk. It means balancing a veteran actor’s determination to subsume his identity into a character, even as, in his offstage life, he is firm in his belief that the man about to take office is a dangerous figure.

The key to a convincing Mr. Trump, the actor said, are “puffs” — his word for the pregnant pauses in the president-elect’s speech. “I see a guy who seems to pause and dig for the more precise and better language he wants to use, and never finds it,” Mr. Baldwin said in an interview on Saturday in his dressing room at 30 Rockefeller Plaza in Manhattan, six hours before show time, his eyebrows already peaked. “It’s the same dish — it’s a grilled-cheese sandwich rhetorically over and over again.”