The main point is to learn these mistakes, SLOWLY.
When we normally set out a goal to learn something, there is always an expectation to learn it within a certain period, and to gain a certain level of proficiency. In the case of Tai Chi, you probably set out your goal as learning all the steps, and be able to do it in (say) 3 months time.
What I would like to propose is to set a regular goal, rather than a fixed-and-be-done-with goal. If it’s something that you really want to learn e.g. piano, your slow goal should be “practise piano for 30 minutes a day” instead of “reach Grade 8 in 3 years time”. If you want to learn a new language, one of your slow goals should be “read Japanese newspapers everyday for 30 minutes” or “speak to a Japanese native speaker for 10 minutes a day”, and not “pass the Level 1 proficiency test in 3 months”. Say you like to learn chi running (a method of running in a low impact way), your slow goal would be “run with this method for 30 minutes everyday” instead of “be able to run a marathon in 3 hours” or “lose 10kg in 5 weeks”.
During these training sessions, put your full focus into doing and listening. You work hard, and you listen to how your body react to the work, and then you adjust accordingly. Setting such a slow goal will help you:
1. focus on doing it the right way
2. enjoy the activity and (sometimes) getting lost in the moment
3. do not injure yourself during your work, whether mentally or physically
I think all these points are very worthwhile when learning something, as oppose to becoming only a performer at the end of 3 months. Being a performer has its bad share of habits, but if you truly want to learn something, the only audience to your performance is yourself. The rest of us are only there to enjoy your moment.
So use slow goals. It’ll get you there faster than you think.