Without a lawyer; can I request discovery from the other party to better prepare? Statements, evidence etc
Yes. If you can figure out how. Which is the same answer to your question about filing for contempt.
Please keep all your future questions to this thread to avoid parallel discussions.
Texas court websites often have DIY pages. There may be forms and instructions for contempt filings. If not, you'll have to google for them.
Discovery is between the parties. You might have to google some to get samples.
The risk of DIY litigation is that going up against a lawyer without one of your own is like taking a rubber knife to a gunfight. You could end up on the ground bleeding.
The reward is that you can save tens of thousands of dollars if you survive.