I wish I could help, but in my experience, trying to memorize a script is what led me to stutter the most as i gave myself these impossible expectations. What I would’ve done differently, is just going over any key points, like the company’s background and memorizing your resume. And make sure to ask questions and research the company’s role and background. Try having the thought of stuttering at the back of your mind, be as confident as you can. Good luck!!