1. The buyer has the upper hand. You can buy any home on the market. The seller can only sell his house.
2. Take your time. It's ok to miss a house. The agent will tell you that "two others are making offers". Don't worry about it.
3. Make the other guy say "it's only $200". When dealing with hundreds of thousands, people don't haggle for $200 or $500. If a person says, $330,000 even if they go down to $329,800 it is still $200 in your pocket.