You say a couple of times just how much this all means to you and how important it is and that's probably part of your problem, here.
You want to do this so much that you probably want every landing to be a perfect greaser and every move to be perfect. The thing that we've all been keeping from you is that they rarely will be. Your skills and confidence will grow but you'll never do everything perfectly every time.
I'm sure you know that if your instructor says you're ready then you are, don't beat yourself up too much if it's not perfect. You'll love it and you'll never forget it.
The day when you have absolutely no apprehension about anything is the day to put your headset on eBay, not today.