When your subject is talking, he gets a chance to express himself. The Real Secret Always exercise self control and allow the subjects adequate time to fully express themselves, knowing that the more they talk, the more likely they are to buy. Get them talking about their opinions and they will like you. Ask them questions so that you can compliment them by writing down their answers. It's much harder for your subject to object to something that is based on what he's told you earlier.
Good Listeners Are Always Rewarded.