How to deal with criticism?
There is no failure or failure, only feedback.
Avoid an immediate reaction and do not get defensive : neither "fight" nor "flee.
Let it sink in and ask for time.
Show understanding, even when unfairly criticized.
Listen, ask questions and summarize.
Criticism as feedback through which you yourself can learn and grow.
Work together respectfully to find a solution.
Make clear agreements about what will happen.
Accept that at times someone will be dissatisfied.
Let go of what makes you look immutable: yes, making mistakes is part of it.