Learning is experiential. Without experience, there is no learning. However much the learner wants to learn, getting over the barriers to experience can impede or even completely block learning. Confident learners to use failure and frustration as investments whose payoff comes in future success.
Many topics challenge the learner to find a balance along some continuum.
Learning to find a balance poses particularly severe barriers to gaining experience for the learner. There is no chance the learner will be successful the first time, unlike many other learning activities. Even if they fell into the right balance, chances are the learner would not recognize that the balance would be struck. Define the continuum for the learner. A simple approach is to explain the reductio ad absurdum on either end.