If you stumble, be your own best friend. Don’t beat yourself up, that will erode your self-esteem. Be a kind and supportive friend to yourself instead.
Ask yourself: How would my friend/parent support me and help me in this situation?
And then do things and talk to yourself like he or she would.
And remember to ask yourself what you can learn from your stumble and if there is an opportunity in this situation. Then take that new knowledge you gain and move forward once again.