My take on it is that being able to look someone in the eye and even though you stammer and block etc you never do any of the safety behaviours to hide your stammer or avoid it. It's like someone with an accent that they want to hide deciding 'fuck it' this is what I sound like; other people can like it or lump it. It does take balls but you're already on the right track. Exposing yourself to the kind of situations you want avoid over and over eventually habituates to the anxiety and it becomes much less frustrating because you've burnt out the anxiety that talking brings. It's about saying "fuck it; this is how I talk and YOU need to wait for ME". The acceptance is in saying "I can either ruminate on how annoying (to say the least) my stammer is and let it grind me down or I can take every opportunity to talk that I want and to hell with what people think". Does that make sense?