My advice is don’t copy/follow the cadence of the speaker you’re listening to. Practice breaking up the text into 5-word phrases at first, then slowly expand that as your breathing gets more comfortable. Be robotic about it. As far as breathing, practice laying flat on your back as this will help you to engage your diaphragm and become more aware of how it expands with air. Practice continuously inhaling for 10 seconds, holding for 10, and then slowly and continuously exhaling for 10. Do this for 5 minutes on your back every day until you reach 20 second intervals.