The weird ways that skill development works is not the way most people practice it. The few that figure it out and do it regularly seem talented, but anyone can do it.
The path to confident, anxiety free performance is simply solving the problem in front of you until there are no more problems, and there is always a solution.
Learn how the brain learns best to solve all of your and your students trouble spots to perform at our best.
There is no more performance anxiety when there is no more wonder about whether we can do it or not as we walk on stage.
Outline and more information here https://ggoodhart.com/the-practices-the-thing-4-week-intensive-mini-course/