I started out without the camera on, just in case of disaster. It wasn't a disaster but I quickly found out it takes a few minutes to become adjusted to holding a straight line and pedaling smoothly. I also deemed the rear tire to be sadly under-inflated. So, I aired up the tire to be properly hard, started the camera, and began my instructional video.
In no particular order of importance: 1) Be sure to brake the front wheel when doing the awkward mount/dismount; 2) Cadence should be above 80, better if 90 rpm; 3) Start with a gear where you don't need a lot of pressure; 4) Have something to hold on to until you are comfortably pedaling.
The video lasts two and a half minutes. After stopping the camera I did another fifteen.
Rollers really are a great way to get you balanced and pedaling equally with each leg. You will start out looking at the front wheel, but as you progress your gaze should be out five, ten, twenty feet. If you stick with it long enough, you can remove one hand. I'm not gutsy enough to go hands-free.