What exactly does an assistant director photographer do? Will it be difficult?

If it is difficult, it won't be difficult, but there is more physical labor.

A photography assistant should have a certain theory of photography (of course, he can study while working)

When you understand, you must carefully arrange the lighting that the photographer needs. Generally, those who haven't learned will not!

Of course, you also need to do odd jobs or something, but if you meet a good photographer, you can learn the skills. When shooting, with permission,

Stay with him as much as possible and carefully study how to guide the subject to swing and guide the subject to the right if you use lights and aperture shutters.

How to discover the beauty of the subject when the elephant enters the role! Can be learned, I hope you come on!