I thought I would update this.
I went to the pre-op. During this they did my height, weight, etc. Then they began to explain the procedure.
She paused for a moment and went to see the dentist next door. She said that I still seemed extremely anxious about it, so have offered to do the procedure under general anaesthetic. Which I graciously accepted.
Quite an amazing experience so far, and every dentist, and nurse I have seen have been very understanding and doing what they can to make me comfortable.
For me, this is the best possible outcome, go to sleep, wake up with a sore face and it's all done.