But like.... that's anything! When I took Calculus in highschool, I had to go home and do the homework. I had to practice, a lot, before I could wrap my head around any of it. The teacher taught us in class and helped correct us when we'd gone the wrong way, but most of my real learning came from working my butt off after class, reading the book, studying the examples, solving problems on my own over and over and over again.
But it would be pretty strange to say "I'm partially self-taught in Calculus!"
And when I was homeschooled before then, my mom didn't teach math classes -- she let me handle that. We bought math textbooks and I tested my way through the book, checked my own answers, figured out what I'd done wrong and corrected my work. But it would still be weird to say I'm "self-taught" in algebra, because everything I learned came from that textbook, at a schedule mandated by my class.
Working really hard and putting in the hours in your own time ≠ self-taught. Everyone has to do that! "Self-taught" isn't an indicator of personal effort, it just means you've had no guidance.
Like..... if "self-taught" includes "I took classes that helped me, but like, before and after the classes I learned through trial and error" and "I took online classes or read/watched tutorials of other artists" and "I'm surrounded by a community of artists from whom I regularly solicit advice and critique, just as I would in a classroom setting" then I'm not sure the distinction of "self-taught" is all that useful, because that includes just about everyone.