A lot of it is being persistent. Doing an animatic is difficult if you don't draw regularly and have some experience with video editing, flash, or some other tool chain. A decade ago there were limited tools, but today there are a lot of options.
A creative person could edit together what they want from movies and shows to tell the story-within some limitations-using video editing software.
There are other options. Storyboard has a shot generator where you describe the type of shot, it generates some generic manikins, and you can draw on top of it. Or just use them directly. It has basic abilities to make an animatic.