I spent the 10 months leading up to my wedding worrying about stuttering during the ceremony. I discussed it with the celebrant beforehand and we were able to arrange the flow of wording to suit me (it helped but didn't stop me worrying though). Maybe you could try something like that? But to be honest, when the moment arrived I found the whole situation so beautiful that I realised I didn't care if I stuttered around my (imminently to be) wife, family and friends. I didn't stutter in the end. Congratulations and I wish you the very best.