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.
MORE LIKE THIS
Fearing Forgetting: Should You Try to Maintain or Relearn Knowledge?
Cognitive Load Theory and its Applications for Learning - Scott H Young