Bob Kegan and Lisa Lahey’s Immunity to Change process (which is more fully described in their book of the same name, and in their first book How the Way You Talk Can Change the Way You Work). You can find that post here. The follow up to their process—the question of what do you do after you’ve discovered your Big Assumption is explored in this post,
Creating the immunity map is a powerful and enlightening process, but it is only the start. The real work comes in testing your big assumptions - creating experiments that allow you to test whether your assumptions are valid and your immune system is right in protecting you from realising your fears, OR more than likely, your assumptions are not valid and your immune system is limiting and preventing you from realising/unlocking your potential.
I'm working on this now and it is tough. I've spent decades embedding these behaviours, so unpacking them and then testing them is not easy. I'm naturally drawn to maintaining the status quo, so I have to actively challenge myself to test, to observe, to reflect, to understand and most difficult for me, accept the evidence.
Would I stop. No bloody way. This is the discomfort required for real growth.