My wife usually orders but if I'm solo I've yoga strategy to make it easier. I just wrote it in another post too but If I'm starting to talk with a person at work or ordering food or anything. I start with an upbeat "hi how are you?" I have a well rehearsed "high how are you?" that's I'm confident I can say. you'd be amazed just how well people respond to a friendly greeting. Especially customer service staff. They are almost always very friendly back. It decreases my tension and anxiety and I stutter a lot less