Do speech therapy really work ?

Do speech therapy really work ? I’m a 20M and I’ve been struggling with stammering my whole life. It’s something that has always holding me back and I really want some control over it. So the next week i am starting speech therapy and I was wondering if anyone here has tried it does it actually help? I know stammering doesn’t have a complete cure and all , but i want to improve myself. If not speech therapy , what has helped you? Honestly, I’m tired of living with this, and I just want to make progress.