I don't want to be that "know it all" but your post doesn't make sense. Initially you say that stuttering is the result of anxiety but then go on to say that anxiety doesn't cause stuttering. Just like in normally fluent speakers, stutterers can experience situation anxiety that can increase the likelihood of a break down in speech. However, this is not stuttering--this makes stuttering more severe. Thus, you are correct in your statement that anxiety doesn't cause stuttering, rather anxiety exacerbates stuttering. Excess musculo-skeletal tension (hard onsets) is a common result of stuttering, not necessarily the cause of stuttering (but it's a bit of chicken and egg). The higher stress on the first syllable of words (in English) is due to the trochaic stress pattern of English (the first syllable often receives greater syllabic stress than later syllables) This is not consistent across all words, however--as you point out some words receive increase syllabic stress on middle syllable (this only happens with words containing three or more syllables, as two syllable words have no middle syllable. And indeed even here it's not often true -- you'll sound funny if you put the emPHAsis on the wrong sylLAble). Slowing rate and reducing excess musculo-skeletal tension are both beneficial pieces of information. However, the breathing bit is a lot out dated. People who stutter do not have a difficult time breathing. They do not need to practice breathing. This outdated treatment has never shown to have an efficacy in the treatment of stuttering. Other approaches like Fluency Shaping and Stuttering Modification have consistently shown efficacy (granted we need more efficacy studies). Again, I don't mean to be a know-it-all, I just felt the need to clarify some factual errors. Thank you for your desire to help.