Mistakes are OK

Your tai chi master does not expect your practice to be 'perfect'.
They are looking for effort and hard work; not flawless practice.

You will be gently corrected every lesson.
Slowly, you come to realise that making mistakes is inevitable... and OK.
There is no need to get upset. No need to become defensive.

When you stop pushing yourself to be perfect and accept your own flawed nature, relaxation follows.