Do your homework on the cars before you visit the dealer (by using our site). Know what you want. Never rely on salesmen for information. Know how much you should pay (www.honestjohn.co.uk/used-prices/). Be aware that the salesman gets very little commission from selling cars, but a lot of commission from selling ridiculous add-ons such as tyre insurance, paint protection etc, that are all available for less than half his price elsewhere.