100% agree with this. The less you care about what you look or sound like, the less you'll fuck up talking. It's all in your head and if you can halt the beginning of that vicious cycle, you can stop stammering as much. I'm also a fan of the "ugh, I can't speak properly today!...*word*. The little break gives you time to distract the listener, it lets you say a planned phrase (re-enforces confidence in speech) and lets you prepare to say the struggle word.