Professor,
I think your jitters or nervousness is sweet because it shows that you care. People are only nervous when they are either unsure or care enough for something to be perfect or just right. And based on your post, I don't think you are unsure. I think you just want to make sure she is happy, pleased, and overwhelmed from all of the emotion that I am sure you will convey through the vows
!! And that's sweet!! Again Congratulations and God Bless!!