There is never a proper substitute for experience.

I have been doing this stuff(film/television work) for a couple years now and I am increasingly impressed by how much I learn and how much I tend to realize how little I actually know during every single shoot I work in. Certainly I find that I am capable of competent task completion but I am always learning the little things and ways to improve in order to polish my skills for this craft and even though they are often just little bits of improvement, they definitely have a positive impact... which is important if I am to actually become better at what I do... and for business, too, of course!