I hate to say it, but if I did have the cash for a course like this, I suspect that when I came out at the end of it I would probably end up being highly critical of my sewing and it would take all the enjoyment and pleasure out of it.
This happened in my teens, I enjoyed dancing, then it was either rock and roll or ballroom. I was persuaded to join a ballroom dancing formation team, fun at first but gradually I began to hate the lack of freedom in the way I danced and probably, the discipline needed. Not for me.