In a nutshell : Yes it can help, but your strategy can probably be improved. Breathing techniques and jaw exercises could help gaining awareness of your own voice and breath, which can help develop more control over your speech. People who stutter often have reduced self-awareness regarding how their voice and speech function. But speech exercices are probably a more powerfool tool in managing stuttering. You could start with slow reading, and gradually increasing the rate over time. They key is to speak with an effortless flow, and with a high level of self-awareness of your own voice (as if you were listening to another person). Then you can practise with close friends or family members to increase social pressure. But this process takes time. Developing lasting fluency requires long term practise. I have a moderate/severe stutter, and I practiced speaking for one to two hours a day over several weeks. I reached a point where I was almost completely fluent, without using any specific technique or making any conscious effort.