EVERYTHING suggested in this thread is 100x cheaper than the medical bills will be. Even with every safety consideration covered, professionals still get hurt, and they have skills and training. Please please please consider that you effectively know nothing about stunts, and, while you can know nothing about cameras and lighting and still make a movie, bad camera work and lighting can't hurt you. Your defensiveness suggests you're particularly prone to "I'll be fine" syndrome, which makes you more dangerous. Reconsider what you're doing so that it's within your ability to do safely. If you're not happy with your current ability, go get some training.