What works for me is finding synonyms for the word I can't say. Before saying the word, I can know if I'm going to stutter, and before saying it, I can change it for another similar word. In a fluid conversation, I stop thinking about what I'm going to say, I just talk without having anything in mind. Those two strategies are the only ones that work for me. There are people who have DAF that works for them, but I haven't tried that yet.