It's basically slowing your speech down. The first syllable needs to be spoken softly with "passive breathing" and the problematic sound won't be harsh. Here's a link to the pdf https://www.stutter-no-more.com and also a video about it https://youtu.be/_yxBPYn7Jso The massage could help like the resonance exercises (basically vocal warm-ups) because those muscles work like every other. Just like before physical activity, you need a warm up.