No advise from this sister. Even though I have been married the longest, you have already said that I am not the wisest.
I have never thought of you as the "old maid", just the single, independent person you are.
I think it's great that you have a person you want to share your life with.
He is a good guy & if he makes you happy, I'm happy.
I ask myself, almost everyday, "what the hell am I doing". And I still don't have an answer.
I don't remember being nervous but that was forever ago. I know you are nervous about losing the control you have over the wedding, but the day will be great. Just let your sisters handle it.