I wanted you to know that I am scared too .My Suzi is 8 months old and needs to be spayed as well. Then any baby teeth pulled will be done at the same time.
One thing that helps is to have A vet that you trust, and feel comfortable with .You can interview them, and ask all the questions about the procedure . Then after that, you will no doubt feel a lot better.
This is what I am planning on doing. I have a great vet, but need to ask more questions in detail before scheduling the appoint. I'll probably wait until after the new year though. Being A single parent, and with the Holidays coming, it will need to wait a little longer. I'd like to have her spayed before she turns one yrs old.