It is a process. One doesn't become radically honest with oneself until one notices how the body physically responds to criticisms. Toastmasters is a good exam

It is a process. One doesn't become radically honest with oneself until one notices how the body physically responds to criticisms. Toastmasters is a good example where I keep noticing the better toastmasters actively solicit criticisms. Even if the message was "your speech was boring" is sufficient to prod them figure out how to improve it.