Unfortunately, people confuse getting “On Pay” as having satisfied chain of title requirements. Many mineral owners unknowingly create title issues for future generations due to not being fully aware of the need to establish a proper chain of title. This comes in many fashions from improper legal descriptions to failing to complete transition documentation. If you are not familiar with how to prepare a Mineral Deed, then you should have an attorney that practices within this area to prepare the deeds. Be sure this is within their area of practice since I have seen many attorneys that prepare deeds with improper (I am being polite) legal descriptions that will require future curative work.
If there has not been a probate of the Estate, then speak with an attorney licensed in TX to discuss what issues may occur in the future. Send the attorney a copy of the will and a detailed list of the properties prior to any meeting. This will allow them to provide better advice and cost estimates. Depending on the complexity, The initial review of documents and consultation should cost anywhere from $200-$500.
You of course have to balance the economics of the values of the properties to the costs of any required curative actions. Professionals assess in this manner all the time.