I am a filmmaker.
No day is the same for me, which is good and bad. It means I never get bored, but it also means there is no consistency or structure. I have to create my own structure. I could be filming one day, editing the next, and pitching or meeting the following day. It depends on what stage of a project I am in. With multiple projects happening at the same time I could be doing many different tasks in a day.
Nothing beats the experience of filmmaking. Whether you learn it in a film school or on your own, practice does make perfect (not literally perfect, but you get the picture).
Here's the first step for high school students
Go out and make a film. It could be a 30 second film, a short film, a documentary, or a narrative. It doesn't matter. Just go out and make something. And keep making things until you get better and better. And then go meet people in the field you want to pursue. In addition to talent, who you know, who likes you, and who can help you also matters.
"You should be a doctor, lawyer, businessman. Get a job. Get a career. See if your friends have any job openings."
I didn't listen. I didn't listen to others. More importantly I tried not to listen to the inner negative voice telling me I couldn't succeed. Well maybe I listened sometimes, but I tried not to believe that voice.
I think the biggest challenge is the emotional challenge of doing something artistic. There is no direct career path. It's hard to see the light at the end of the tunnel. You have to talk yourself "off the ledge" so to speak and just have faith.