The more we practice the more confident we seem to grow in our abilities. The more confident we grow, the less humble we usually are. Setbacks are a great time to practice our humility, because we just got humbled. They are also a time we are forced to practice patience. Assuming the goal is still possible, but will just take a little longer, we must be patient to keep along the path and accomplish the goal.
Remembering to be patient when things are moving quickly, and humble when things are going well, will help calm the emotions and avoid some of the poor decisions that lead to stock market bubbles, or stress fractures. There is no guarantee you won't go off the deep end, but putting some patience and humility into the "irrational exuberance" that we easily are caught in may just help you realize that the next step will be over your head.