Ironically, while creative nonfiction and memoir writing can be a tool of self-discovery, you must have some distance from the self to write effectively. You must know when you are ready to write about certain subjects and when you are not - when you are still sorting them out for yourself. Perhaps you will be able to write about a small aspect of a large experience, focusing your attention on a particular detail that leads to a larger metaphorical significance.
This is not to say that creative nonfiction or memoir is devoid of emotion; on the contrary, the most powerful nonfiction is propelled by a sense of urgency, the need to speak about events that touch us deeply, both in our personal history and those that occur in the world around us. The key to successfully writing about these events is perspective.