I have to disagree with the idea that clipless pedals are the end-all, be-all for technical trails. While they may provide some added efficiency and control, they are not necessary for everyone. In fact, many experienced cyclists prefer to use flat pedals, as they allow for greater freedom of movement and a more natural riding style.
As for building confidence in using clipless pedals, I would argue that it's not about specific skills or techniques, but rather about developing a deep understanding of your bike and your own abilities as a rider. This comes with time and practice, and cannot be rushed or forced.
Furthermore, I take issue with the idea that clipless pedals are inherently superior to flat pedals. Both have their own unique advantages and disadvantages, and the choice between the two ultimately comes down to personal preference and riding style.
In the end, it's important to remember that there is no one-size-fits-all solution when it comes to cycling gear and techniques. What works for one rider may not work for another, and it's up to each individual to find what works best for them.