Start where it is quiet
Confidence is built, not demanded. Begin in an empty parking lot, then quiet residential streets, before anything with real traffic. Let your teen get the basics, steering, stopping, lane position, smooth and boring before you add pressure. Each calm success is a brick in the wall.
Watch how you talk in the car
Your tone is half the lesson. Gasping, grabbing the door, or barking corrections teaches panic. Try to narrate early and calmly: tell them about the stop sign a block ahead, not the instant they reach it. Keep feedback specific and kind, and praise the thing they did well before fixing the thing they did not.
Build a sense of progress
Nervous drivers need to see they are getting better. Set one small goal per drive: today we nail four-way stops, next time we try a left turn across traffic. Naming the win makes the progress real and keeps the nerves from running the show.
When to bring in a pro
Sometimes the calmest thing you can do is step out of the passenger seat. A certified instructor in a dual-control car removes the family tension and the fear of a mistake, since they can brake from their side. Many anxious teens relax noticeably once a neutral expert takes over the coaching. WMST instructors do this every day, and adult-style private lessons work for nervous teens too.