Research on teacher emotion regulation is typically conducted by outsiders and focuses on how emotion is regulated. This self-study was conducted by a practicing teacher to explore the lived experience of teacher emotion regulation and the many influences that inspire the need for such regulation. Throughout a 14-week semester, daily "in-the-moment" recordings of emotion were collected as they arose, and analyzed weekly. With a critical friend, further analysis was conducted to explore the genesis of the emotion as well as the response and possible alternatives. We believe that understanding the experience of the emotion is possibly more important than how it is regulated. Through reflection, this teacher began to resolve deeper issues that had evoked negative emotions, which shifted her approach to difficult situations and reduced the amount of negative emotions experienced. We conclude that the research on emotion regulation should focus on understanding the underlying issue triggering the emotion than on controlling the emotions displayed.