Experience Matters

If any one has spent any time on a film set a few things you will notice if it is your first time...
There is too much waiting.
Hair and makeup, lighting and prep. Back when I first started people shot 1 page a day for 90 days. Today 3-4 pages a day for 30 days (not low budget, studio pictures).
Now that digital cameras have taken over, nothing has changed, and things have become MORE boring.
To wait on set is dull. It's my pet peeve. Because wasted time is important time and your time should be important. Sometimes it can't be helped. Like waiting for equipment. Or that the talent needs to rehearse. That's commendable. The studios have the budget to sustain a lot of delays.
For your own projects, it's not enough to prepare. IN fact, over preparation sometimes creates worse delays because the director isn't satisfied until what is in his brain isn't on his screen. The taskmaster director is notorious in Hollywood. But the taskmaster cinematographer could potentially derail your production. A cameraman who is a failed director is the worse kind. They are the ones who can see your project better than you can. But worse...attempt to bend it to his will. You don't see it as much anymore, since we're in a touchy feely world now. But when I started, plenty of those.
In a way, there was a reason why cinematographers were in their 50's when I started. It's because they understood their position through rising through the ranks.
These days, a kid picks up a camera and calls himself a cinematographer. That is disrespectful to the craft.
On set experience matters. Practical knowledge versus film school security will have reality thrown at them.
Prepare yourselves.