Try and make your own film. It is very easy now. It wasn’t in my time but these days home video is not all that expensive and you could start with home video and try and make a story about a sparrow or an earthworm or a hedgehog or a blue tit, and you will then discover how you put shots and pictures together in order to tell a story, and whether you have got any skill at doing so, and whether you want to spend your time sitting in a tent waiting for a bird to do something. And, having done that, you will end up with something that you can then show to somebody who has got money and wants a programme – and you can say: ‘There you are, this is what I can do on no money at all… why don’t you help me do something more ambitious?’
David Attenborough’s advice to an 8 year old wanting to follow in his footsteps.