I work a cashier/customer service job and something that has helped me a lot personally is making sure that everyone I work with know that I have a stutter so that my coworkers are understanding and having them around and know about your stutter already boosts your confidence so a little less likely to stutter and I’ve had times in my job where customers would laugh or smirk at my stutter and having good coworkers that have your back is always great! You will develop the “I don’t care what anyone thinks” mentality pretty quickly especially when the people you work with are understanding and you start to know the job more and more. Good luck wish you the best!