First, make sure you know what is right. Then diagnose your deviations. And then, correct them.CHEN XIAOWANG
I heard this from the Grandmaster in a Taijiquan (Tai Chi) seminar in Bariloche, Argentina, in 2009. He explains it himself:
This is very important. Many people simply copy the form, and don’t correct their mistakes. When they teach, all their students do is make the mistakes bigger.