Hi Cali-girl and welcome!
What everyone notes here is on the money. I remember my very first surgery was a spinal fusion. Like you, it was my first surgery. Gawd, I questioned, etc. What everyone here has shared, I hope, will help bring some peace in your heart and as you can see, we are all here, lived to tell the story (and yes, even the Nurse Butt jokes!).
Just a suggestion: I hear that reiki, performed just prior to any surgical procedure will help as well. I'm not sure if you are familiar with it, but I know nurses in the State of MA have it as part of their licensing. I have reiki done all the time. While there, ask if any of the nurses are practicioners and see if someone will perform this over you. It's a great way to take in "healing energy" to help keep your nerves calm, to help alleviate the stress levels. Just a thought.
Anyway, we'll all be cheering you on and know we are ALL here for you! Please have someone keep us posted on how you are doing and know that you will carry us all with you during this time.
Phyllis