a friend of mine started to bug me by constantly beating me heads up, he's aggressive generally in poker and fond of a bluff, i noticed that each time he bet my mindset was he's either laying a huge bluff on me or he has the nuts - thus increasing the pressure on my decision making.
The way round this type of player?
On a few occasions he checked down a couple of pots when i had huge hands and was waiting to trap him, he didnt fall for it and i prob didnt get the most value from the pot but i showed and he noticed the hand. This happened once or twice more then suddenly he had gone from aggressive betting that had me under pressure to someone who was afraid to bet for fear of being slowplayed.
i think there is a lot of importance heads up to defining the type of player - TAG, LAG etc etc and adjusting your play accordingly