I always tell my students to be very wary of what they see on YouTube. Lots of people post videos of how they work, and it's exciting for beginners/amateurs to watch, but they don't understand that someone who has been making pots for 10 years has evolved into their throwing techniques. As beginners they just don't have an understanding or feel for the clay to be able to work that way. I definitely don't throw the way I demo for beginners, because I show them a simplified method that has one distinct action for each hand. I also get a fair number of students who came from other studios where the teacher has taught them they way he/she throws, and it's too complicated for a newbie to understand, and they struggle with centering.
I had a student once who was working on the wrong side of the clay for the first few days of class, and I never caught it because every time I walked by she would take her hands off the clay and look busy doing something else because she was so nervous.