This probably ain't worth much, but for what it's worth, here's my experience with film school:
I got into all of this by accident. I had a career as a high school teacher. But something just wasn't right. One Summer, I went crazy, recording an album's-worth of music in my "home studio" (my PC, with a shitty mic). I had so much fun with it, I decided that music was the thing for me.
After much deliberation, I decided to move to Memphis. Understandably (Memphis being the birthplace of blues), UM has a really nice audio engineering program. In order to pay in-state tuition, I decided to just live there for a year, before enrolling full-time.
While waiting for a year, I took a couple pre-req classes. One of those pre-req classes was Intro to Videography. It actually makes sense for videography to be a requirement for an audio engineer, as they should all have at least a basic understanding of how to sync sound to video.
Anyway, the pre-req was a 100-level class. I looked at the class description, and attained that I already knew everything that was to be taught in the class. You see, I actually had some experience with video, having focused a lot of my Anthropology degree on Visual Anthropology (documentary-making).
So, I approached the professor, and asked permission to be allowed into the 200-level Intermediate Videography class. The school of music told me that, obviously, the higher-level class would also work as a pre-req. And, thankfully, the professor of the videography class allowed me in, even though it was supposed to be a class strictly for filmmaking majors.
So, there I was, an outsider, in a class full of film students, all of them with a full year of film school underneath their belts. And you know what? I bested them, by a large margin. By the end of the semester, I was practically tutoring my classmates.
For the final assignment, we had to propose our production plans to our professor. When I ran my plans by my prof, he told me I was biting off more than I could chew. He strongly advised that I scale it back. I told him, respectfully, that I felt confident in the play I'd laid out, and that I could get it done. He reluctantly approved. What he didn't know was that I was actually holding back. I didn't tell him about the action-sequence I had planned. I didn't tell him about the breakaway bottles, or the arrow being shot at a dude's head, or the near-collision with a car. The production ended up being a smashing success, and we got an "A+".
Every year, the University of Memphis has a student film festival. In addition to larger projects, from Master's students and Senior thesis stuff, this film festival also chooses to show one example of the best work from each level of filmmaking. The best beginner work, the best intermediate work, the best advanced work, etc. My film was chosen as the best example of intermediate work. Me, a non-film-student, bested all of the sophomores in film school, with considerably less education in filmmaking than any of them.
Now, mind you, the University of Memphis ain't USC. Still, this experience was rather encouraging. Not only did I have a lot of fun, but it made me think, "hey, I can do this".
Since then, I've networked, to the best of my ability, with the best indie filmmakers in my city. None of them went to film school. I've got a friend who just recently began a professional career in filmmaking. He did not go to film school.
Take a look at the top directors in Hollywood. Most of them never went to film school.