You can also obtain open house information from Trulia. All you have to do is search the area that you are interested in and the open house section is located on the left side of page. If you are interested in any specific listing, you can also schedule an appointment to view the property (preferably with your own agent) based on your schedule.
I would suggest that you hire your own agent, the sellers/listing agent (they represent the sellers and their best interest). You do not pay a fee to have your own "buyer's agent" represent you in NYS, unless otherwise agreed to.
Licensed Real Estate Agent
Cruse Realty / Cruz Network of Realtors