The AA Cars has advised motorists to be cautious when negotiating the purchase of a new vehicle. Buyers should avoid showing excessive enthusiasm for a car, as it can diminish their bargaining power. Experts recommend maintaining a neutral demeanor until the financial terms are agreed upon. Emotional attachment can lead to hasty decisions, so it's crucial for buyers to be prepared to walk away if the deal does not meet their expectations. James Hoksins, Managing Director of AA Cars, emphasizes that the best position for buyers is to be willing to leave if the numbers are not favorable. This approach often leads to better offers as dealers may reach out with improved terms after a buyer walks away.