Learn from different sources, not only one, then it is not stealing but Research.
Practice, practice, practice, different ways and often, long time.
Bob Ferguson, Toastmaster in Excalibur Speakers of London, delivered a Workshop, at the Division B, London Toastmasters contest: 45 minutes all worth to listen, then, apply and practice.
The images were more, and better, mostly listen to the speach. I put it in video format only as like that, more websites accept then merely sound.