Back to some of the issues discussed relative to movement, hesitation or locking up, due to fear or apprehension.
You've hit the nail on the head. It's the numerous times before success and then a loss of confidence failure that is most debilitating.
Below, is a quote from George Karl, Head coach of the Denver Nuggets. The Nuggets have the second longest win streak in the NBA right now and they don't have one super star on the team. They win with team play, intensity and speed. They lead the whole league in a number of categories, one is points in the paint and they are second best in the NBA with their home win record. If you read this and apply it to skiing it works beautifully.
"We talk a lot about the word trust," Nuggets coach George Karl said, "trusting each other, trusting the concepts, trusting the intensity. The word trust has been in our game plans a lot. And I have to trust them, they've earned that trust."You have to have trust and confidence to ski challenging terrain. not in your teammates in yourself. You have to have worked through the concepts and techniques and added enough intensity to make the right movements, no matter what is thrown at you.
First, you have to develop trust in your ability to make movements. This is not the place for faking it, no false over estimation of your skiing in challenging conditions is allowed. This takes time and dedication to develop, it doesn't come by itself. You have to practice and then test yourself in challenging areas that are totally safe first. Once you start trusting your body, then the mind, "control center" relaxes and the body begins to move even better. Confidence is a tricky concept, because many can have too much, which is dangerous. Too much confidence without proven build up in your skiing is dangerous. Trust is the key work, do you trust your movements and how you learned them? Will they be there when you need them, can you rely on your reflex actions to recover? All questions you need to ask yourself.
Developing cautious, confidence is best.