Not that helpful but good enough. If you have access to speech therapy then I wouldn't recommend it at all. If you don't then you can give it a try. There are some quite helpful exercises and tricks that did help me a lot understand the reasons for my stutter. I don't know how it would work out for you, everyone's different and everyone's stutter too is quite different and a professional therapist, working with you, while understanding you as a human being is by all means, the best thing. I'd suggest you give it a try for a month and see how it goes.