As an adult learning a new skill (e.g., piano playing), you might move your body in ways that are hesitant and uncertain. You may say “Well, this is to be expected. After all, I’m just learning. Eventually, when I know what I’m doing, I will become confident and the way I move will become secure.”
There is no guarantee that this will ever happen.
You may find that your movements become a little more effective, yes. But, the confidence that you are expecting may not appear.
Piano students often equate the stop-and-start movements of adults to the wobbly walking of children. You may say “Of course my hands should be shaking, and of course there should be false stops and starts. After all, this is what children go through when they learn to walk.”
Yet, that’s not what children go through when they learn to walk.
It’s true that they trip and stumble and are anything but graceful. But, there is a huge difference between ungraceful movements that are the result of fear and ungraceful movements that are the result of trial and error.
Most adults hesitate because of fear.
Give trial and error a go. Notice the difference.