"If you wait until the right time to have a child you'll die childless, and I think film making is very much the same thing. You just have to take the plunge and just start shooting something even if it's bad"

This quote by James Cameron is a metaphor for taking risks in life. He is recommending that if you await the perfect moment to do something, you might never get the chance to do it. This holds true for having a child, as well as for making a film. He is encouraging people to start and begin shooting something, even if it is bad. This is due to the fact that it is better to have tried and failed than to have actually never ever attempted at all. He is suggesting that by taking dangers and beginning something, even if it is not perfect, you can discover and grow from the experience. This is an excellent pointer to take dangers and not hesitate of failure.