Seriously, get legal advice from a useful lawyer. Where I live the Montgomery County Sheriff's Department has citizen patrol (a civilian adjunct for support roles and ride-alongs). The head of that group teaches CC and gun safety. A pro-gun law firm has a lawyer in each class distributing cards. These people know the law and are very close to LE. They know what is acceptable and what is not. They will come to your defense 24/7/365.25 anywhere in the USA.
That said, the part of my earlier post regarding pressing charges was important. If you wound somebody but do not prosecute for trespassing, you will probably get hit up for assault. If you successfully prosecute for trespassing you are immunized against a countersuit. But as above, get legal advice. My information comes from a neighbor who is friendly with a judge. (Friend Of A Friend means no more credible than Urban Legend).
Another facet of Texas trespass law is that the property owner or an authorized caretaker can shoot the trespasser.
Your life is on the line and you should take this seriously. Get legal advice, form a strategy, execute it ruthlessly.
If your strategy includes shooting somebody, be sure to use a gun that is viewed favorably by juries. Avoid military-style aggressive looking guns.