The other guys pretty much nailed it. You need to make your home look like a model home (as if no one actually LIVES there). Also, take down pictures on the wall, especially pictures of family. It's not that your family is ugly, it just helps the potential buyers see themselves in the home rather than another family. Anything you don't need to survive should get packed away into storage.
A Realtor can help you devise a market strategy depending on your needs. If you need to get out fast, we can check market trends and price accordingly. A good Realtor will listen intently to your needs and deliver. You do not actually NEED a Realtor to sell your home, but it is a very good idea because we will set up advertising campaigns, handle calls and visits from prospects, and protect you in the negotiation process.
If you were to pursue this on your own, your best bet is to check out fsbo.com or something to that effect. They may be able to advise you on how to list the home on your own. The home should get onto the MLS to get the most exposure and sell rapidly. This can cost you $400-500, or it is included in a Realtor's fee.
Staging and pricing are VERY important in getting a quick offer. A realtor can help you with both of those. Even a "quick sale" can take up to 45 days for closing, and funding.
If I can help you further in any way, please contact me. There is no harm in getting an expert opinion, especially a free one. I'm just up the road in Austin.