This particular spill has to do with this particular material with this limited effect. Well it is. If you are prepared, if you have no more than three points to make, and if you make them in short, concise sentences, you stay in control of the interview. Cameras are all around us. Get used to it, and be yourself whether it's national TV or the wedding videographer.
Some people like to rehearse in the mirror or in front of a home camcorder.
It isn't brain surgery. And remember, whether you are brilliant or not, most viewers who don't know you and are not directly affected by your activities, won't remember anything about it after a few days.