Not hiring a real estate professional to assist you in the sale of your property is not necessarily in your best interest or will save you money. Is the property you are selling a house, land or commercial building? First, are you comfortable in determining the market value of the property? Are you aware of the State Laws regarding disclosure of the condition of your property? Are you available to present the property to a prospective buyer, presumably a stranger? Since you wish to owner finance, are you aware of the laws governing notes, Deeds of Trust and foreclosures and the duties of your successors? If you can answer yes to these questions, then you may be ready to venture into an agreement once you and your buyer have agreed to all of the terms and conditions of the sale..
If so, a binding legal contract should be prepared. This can be done by an attorney or a licensed realtor, perhaps on a fee basis. When ever you sell real property in the State of Texas, you are guaranteeing to defend good and indefeasible title to the property from the sovereignty of the soil. Therefore, I recommend that you use a Title Company to close your deal and furnish a Title Policy to your Buyer.
If this hasn't given you the guidance you need, feel free to contact me or a Realtor that you know.