When practicing a skill that you have forgotten, you may lack the confidence to pick it up again.
However, those doubts are exaggerated. Not remembering is normal, and relearning happens faster than you may expect. Yet, you may still lack self-confidence, which will undermine your self-image and motivation.
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Rebuilding confidence is not the same as building confidence.
You think you'll excel, but considering the probability of success and feeling confident is not that easy.
Framing effects happen when the same thing looks different when the context change. If you're a good student in a mediocre class, you feel smarter than if you're a good student in an elite class.
When we improve in a skill, our mindset will start to shift from play to performance. Rebuilding confidence requires you to relive that initial play mindset.
The habit-forming philosophy is that you should do things slowly and steadily. Slow and steady leads to a more sustainable strategy for the long-run. But in many areas, this strategy doesn't apply.
The mistake here is assuming slow or fast always works best, without first checking if your specific strategy will be the best approach.
Relearning is an excellent strategy for lifelong learning. The problem is the pain of rebuilding confidence. You may remember a better ability than in reality, so even doing your best with the old skill will seem sub-standard.
However, if you can push through this short-term feeling of inadequacy, relearning starts to look good.