Even if you’re going to hire a General Contractor to build your home, you can still save thousands of dollars by learning as much as possible about the building process. As a matter of fact, I used the information from House-n-home-building when I was a Project Coordinator for a Builder! It teaches you the right questions to ask your builder, and includes written specifications that you can use to ensure that you are getting what you pay for. There are a lot of good builders out there, but there are also a lot of bad (albeit nice) builders out there. Make sure your start the building process with as much information as you can, and I can assure you that the process will go much more smoothly.
Having said that, don’t second guess everything that your builder tells you…you hired him/her because they’re the expert, but make sure you understand what they’re doing, and that it is exactly what you want.