Is it necessary to have a teacher (or mentor/coach) to master every skill? What if I am taking an online tutorial with pre-recorded videos? Can I count that teacher training?
I have read the concept of deliberate practice and 10,000 hours of practice being needed to become an expert. But my question is whether these 10,000 hours need to be (partially) guided to receive personal feedback and/or coaching, or whether self-learning is sufficient?