I usually block on the first sound of a word. To overcome it I use the technique of elongating it. If I find myself slightly out of breath, I take a deep breath. I used to find doing that might look odd to others, but I have stopped caring what others think of my speech. This book is really good in both exercises as well as emotion handling. I have read it multiple times. My speech therapist had given it to me. http://www.stutteringhelp.org/sites/default/files/Migrate/book0009_may2010.pdf