Being nervous is a natural state when one of our babies is going through this. I just had it done and it was difficult to deal with, mentally. BUT....I am sure she will do fine, just like my Sassy did. Sassy didn't have any outside stitches. And the Vet told me to use Infant Tylenol for pain if I felt she needed it. She is three and a half pounds so her dosage was just two little drops out of the dropper.
All the best to you. Hope you and she get through this with flying colors.
I know you will feel much better once it is done and behind you.