If you contact and deal with the seller's agent, it will be like going to court using your opposition's lawyer. There are plenty of Realtors who can represent you exclusively, cost you nothing, and help guide and protect you throughout the entire home buying process. Those of us that serve the public in that capacity are called Buyer's Agents or Buyer's Brokers. You would be well advised to secure the services of an experienced, full time Buyer's Broker.
All the best!