Perfectionism is the enemy of people. It will keep you insane your whole life, and it is the main obstacle between you and teaching a good yoga class. It will ruin your teaching.
Perfectionism blocks playfulness, it blocks your ability to solve problems, it blocks the flow of prana. Perfectionism means that you are desperately trying not to mess things up. But the people who come to your class are a mess (I say that respectfully). They don’t want a perfect teacher. They want a helpful one. Your perfectionism makes them hold their breath, but you know that’s not what they need. They need to breathe.
So… relax, breathe. Be present. Be engaged. And let things go as they need to go. Your teaching will then flourish, and you will know it.