When I started my current job 4 years ago, my stutter got so much worse than it was previously. It was such a source of stress and negatively impacted my personal life as well. I didn’t know if I would ever get back to my old self. After a year or so, maybe more, I started gaining the personal connections and general business knowledge I needed to speak confidently. My early struggles were due to me knowing nothing, but that vanished over time. TLDR - fluency improves with comfort. Don’t let a bad start affect your long term outlook. New jobs are tough for anyone.