Also, beware of what are known as "trust mills." There are people who are aggressively selling living trusts to people who don't need them -- and most people don't need them. So avoid anyone who is advertising that kind of thing. It's best, as realtraveler said, to go to an estate planning attorney. Though if your financial situation isn't complicated, you could probably also go to a neighborhood-type general practioner lawyer, rather than a specialist, which might be less expensive.
Here's an article on "trust mills":
Trust Mills Illegal