While it's not entirely accurate to compare my inept tapdancing with yoga practice, what is similar is that I was blind to whether or not I could really tap dance, and got a bit confused by the fact that I was on a stage, in my shoes, with an audience, and had just enough experience to draw from to make me feel confident. The wake up call for me was that I didn't get the part. In yoga practice, the wake up call might be that you can't stand on your legs comfortably, or don't feel well. Is your yoga practice serving you? Are you excessively identified with your image as a yoga practitioner or teacher? These are good questions to keep in mind.
A good friend of mine recently said "When you've named something, you've killed it," meaning that once you think you know about something, there's no room for learning. As experienced yoga practitioners, indeed with any pursuit, it's a challenge to set aside our understanding of things, to make room for new insight. It's the challenge of creating an open and receptive state of mind. It might help to imagine you've never been to yoga class before, and notice when you rush through movements or asanas that are familiar, because you feel you already "know" what they are and what's involved.
In any case, whatever your practice, the state of mind with which you approach it is as important as the practice itself. And maintaining that connection to an open mind, and maintaining a practice over time is a good plan for understanding, and a clear view of reality.