My honest opinion is if you have never sold a property before, you will be better off with a realtor.
If your property is priced correctly it will sell. Most folks that I deal with on the mortgage side that are making offers on FSBO's look at the comparable sales. Figure out the amount they would offer and reduce the figure by 5% the same as you would be paying except you have the headaches that go along with knowing what needs to happen to sell a property. I am in no way condoning the math or the vaidity of the stratagy, I am just telling you what I hear when a buyer is making an offer on a FSBO.