This guide will walk you through the paperwork for selling a house without a Realtor and various other steps that can give you a leg up. Texas requires those selling FSBO to fill out and file many documents and forms.Several of these documents are legally binding agreements. This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas. Are you thinking about selling your San Antonio real estate or property? Do you have a home you are considering selling?