Dont be nervous man (or ma'am). You've been doing ur job for years, and they know that. If somebody shows me they were a state champion at a sport in highschool, and they are badass. Now they say they won that with a broken leg, they are even more badass. I'm not saying that a stutter to a job is as bad as a broken leg is to sports, but speaking from experience, the people you should be caring about will see that you do your job as well if not better than anyone else, and appreciate what you have overcome. It also shows how you won't let stupid shit get in the way of you getting ur job done.