This is what helped me- i made a mental note of all the starting letters of the words that i stutter in while conversing. Its mostly the words that start with R, Z, B for me. So i picked up an empty book and wrote out that alphabet in as many beautiful ways as possible. Then when i read a book or an article i circled that word, took a pause and tried to relax my mouth muscles and then uttered that word. Continuous practice of this method helped me in the longer run. Now i hardly ever stutter, even in public :) To me it is the fear of saying that word which consumed more than stutter itself. Hence that practice.