In Texas, as long as your will is entirely in your own handwriting you do not need a witness or a notary in order for it to be a good will and able to be filed in probate court when you die. You can also have it witnessed by other people if you want to or have it notarized, but again, what's necessary is that it be entirely in your own handwriting. It would help if the people you expect will be probating it can recognize your handwriting and if they could testify in court when the time comes that that is in fact your handwriting and your will.
If that doesn't answer your question, I'd suggest reading the Probate Code regarding what needs to be in a will and how to execute it when you're done so it's legal: http://www.statutes.legis.state.tx.us/Docs/PB/htm/PB.IV.htm#00.
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