The moment you start arguing...
...with a client, you have already lost. They say "It's too expensive," and you instinctively say, "Actually, it's great value because..." This is a game of ping-pong that nobody wins. You cannot argue and understand at the same time. Put down the paddle. Next time you feel the urge to counter an objection instantly, STOP and take a breath. What happens if you just listen instead?