Typically when someone is ready to sell their home they contact a real estate agent to guide them through the process and market their home. The biggest part of it for them is they want someone looking after their best interests.
As a home buyer wouldn't you want the same? Especially if you are a first time buyer, there are so many things about the process that you are not aware of or do not have access to the way a Realtor does. Using a buyer's agent, means the agent is working with your best interests in mind. A buyer's agent will work to negotiate the best price, ensure the property is inspected, oversee the loan process and make sure you have the representation you need. Things you tell a buyer's agent remain confidential.
It might seem like using a buyer's agent means you are going to pay more -- but that's not the case. Although there are situations where agents charge a flat fee for the service ($150-$300), in most situations they are simply working for the same commission that is paid by the seller and split it with the seller's listing agent. This money would be paid to the sellers agent regardless of a buyers agent being involved or not so there is no money savings to a buyer not to use an agent.
Additionally, I have been to a list a property many a time when the seller bought directly from the owner without representation thinking they were getting a "better deal" and they had ended up paying more for the home than it was worth. As a buyer you may see a home that looks nicer than the other homes you have looked at in the price range but you do not know how to figure in the area, the style of home and what the difference is for above and below grade sq footage.
Simply put use a buyers agent to help you find your next home.