Honestly, try not to stress about it too much, I know it’s really scary but the more you stress the more you’ll think it’ll hurt which will make your body tense up making it hurt more. Take Advil before hand like 800mg 2x extra strength tablets and eat a light meal like an hour beforehand when I got mine put in they told me to wiggle my toes if I felt a good bit of pain and it did help take my mind off of it, I’m sure they’d also let you bring someone for support too