Lance - The best person to answer this question is you. Do you have any experience in real estate? Are you willing to field phone calls & hold open houses? What other forms of marketing do you plan for your property? How will you go about pricing in today's market? Can you objectively evaluate the current condition of the property for any necessary improvements and staging? How are your negotiating skills?
If you can honestly answer that you are fully capable of handling all of these things, and a few more I overlooked, then maybe a flat fee MLS listing is for you.
However, making a mistake in real estate can be very expensive. That is why agents carry Errors & Ommissions insurance, even though most of us do this full time and conduct multiple settlements a year.
If getting into the MLS were the holy grail to a successful sale, we would never have any listings expire, but they happen every day because an MLS listing doesn't guarantee a sale. Right now there 251 active listings in Chantilly in the MLS... how will you make yours stand out