Don't Use the Seller's Agent
One of the best reasons to hire a real estate agent is that the sellers are likely to use their own agent -- and you want to keep that agent from taking over the process. In fact, the seller's agent may pressure you to let him or her represent both of you, in a "dual agency" relationship that primarily benefits the seller. (The less scrupulous sellers' agents don't make it clear that they're working for both people, but if only one agent is involved in your transaction, it's fair to assume that the agent's loyalties are with the seller.) It's better to have your own agent -- or, some experts assert, no agent at all -- than settle for dual agency.

Keep Control Over the Process
You're the only one who really knows what you want in a house. Even if your agent is scouting out homes for you, there's a lot to be said for scanning the listings and attending open houses yourself. You may find out that your agent doesn't understand your needs as well as you thought, or won't take you to see "FSBO" (for sale by owner) listings. (For more on what you can do on your own to find your dream house, see Beginning Your Home Search.)

Educate Yourself
Even if you do use an agent (or a lawyer), it's wise to learn as much as you can about the home-buying process. For example, educating yourself about the market value of comparable homes in the area will protect you against over-aggressive agents who might urge you to bid high for a particular house. And you'll prevent misunderstandings and reduce the stress of being told to "sign here" if you study the contents of the various real estate documents in advance.

Reasons to Hire an Attorney
Except in states where it's mandated, an ordinary real estate transaction doesn't require an attorney's help. By now, real estate transactions are so standardized that most people in your state will use the exact same purchase contract, just filling in a few blanks.

However, if legal issues arise that your real estate agent can't answer, you'll need an attorney's help. Although good agents know a lot about the negotiating and contracting part of the process, they can't make judgments on legal questions. For example, what if your prospective new home has an illegal in-law unit with an existing tenant whom you want to evict in order to rent the place to a friend? Only a lawyer can tell you with any certainty whether your plans are feasible. Or, if you're drafting any unusual language for the purchase contract, or are concerned about some language in your mortgage, you may want to have an attorney look the documents over.