For when your mind runs faster and you stumble over words, one simple technique you can use is simply speaking slowly. Speaking slowly helps to concentrate on what you're saying and helps to avoid some of the stuttering, also helps to remain calm. Not veeeeery slow but slow to the point where it seems almost a bit too slow. I tend to speak fast by nature, plus when I'm not stuttering I subconsciously try to get as much out in the fluent phase as I can. Both make dealing with stuttering harder so I try to avoid doing them. Speaking slower helps considerably. For when you can't get anything out, the best is to "let it go" mentally and physically for 1-2 seconds, try to let go of the mental strain and relax tense muscles (face, jaw, tongue, neck, chest) then continue exactly where you stopped. Don't repeat previous words or sentence parts. There are techniques both for the letting go of blocks, and after that for the soft continuation of speaking. Else you just try to get through the silent block with more and more force, putting more and more physical and mental strain on yourself, making the block worse and worse. There are techniques both for the letting go of blocks, and after that for the soft continuation of speaking. Using replacement words is common avoiding behavior amongst stutterers. I know stutterers who are successful with it and can speak fluently in most cases using it, but those are the exceptions. My observation is that most people including myself are not good at it, doesn't matter how hard you train it, you'll likely make things worse. Therapists will tell you not to do it. It's better just to say exactly what you want despite how hard it seems to say it. You waste a lot of mental capacity and you'll get tired faster when you're always searching for synonyms, or are trying to change the sentence while you're saying it. You might develop letters or words you'll have more and more difficulties with. Lastly, I'm not a licensed therapist, everything is my own experience and what I picked up from speech therapy, might not apply to everyone. My best advice to everyone is to get professional help, a psychotherapist (working on the emotional part) and a speech therapist (but find one that works with stuttering, not just with general speech issues, others are useless) and work through it with them. Stuttering is not curable, you'll always have ups and downs with it, but you can improve both the speaking and how you're living with stuttering.