I have done it and had it go fine, however there is a lot more to a sale than getting a contract, there is title commitment, disclosure, closing arrangements. Title company does not deal with creating your contract. It is not like a realtor does nothing. If you are comfortable with negotiations, following a not-that-complicated process, know or can find a good title company to work with, and can read and understand a title policy then you can do it. If not, a couple hours with a real estate attorney is money well spent to get a good contract/disclosure, good title policy, and good closing. You can get a FSBO book from your local library "House Selling for Dummies" for instance that will have a nice checklist.
It would have been ideal, before you planted the sign, to get a valid contract, disclosure, ID title Co., and create a checklist for what you will do and what the buyer needs to do. You may be asking them to leave their comfort zone and if it seems like you have your act together they are more likely to make an offer. I would also put together a property sheet-- Name, contact info, address, price, zoning, Tax ID #, list of features and fixtures included, a couple photos, and neighborhood benefits. A couple comps if they are favorable to your case.
Expect many of the first responders to be realtors. Have a set message to give them and do not stray. They will ask, "Am I protected if I bring you a great buyer?" That means will you pay me 3%. Know your answers in advance and be firm. Second responders may be lowballers, sniff them out and tell them you do not want to waste their time. Looky-Loos are common as well, sniff and send them on their way. You will know them after a few.
Once you get interest, have an agreed upon bottom line before you entertain offers. It is possible that you will not get a full price offer
need to discuss your bottom line in advance. Similarly, you may get an offer that is contingent- full price once I sell my house, lease/purchase, full price with new roof, etc. The buyer is likely to need an inspection and appraisal, they may come back with an inspection report that finds something that they demand fixed and you have agreed on a price, it could appraise low. A good realtor helps to ID inspection issues and set a price that can meet appraisal so you will need to know how to proceed. Once again, the Eric Tyson book mentioned above can help you create a process that will give you and buyer more confidence, even if it is false confidence.