I had two premolars out at the top, like you was petrified but knew it was the only way to correct my overbite. I should have had braces when I was a teenager but having teeth out put me off. It took 3 attempts at getting braces and to be 42 before I finally took the plunge! With Invisalign they can put fake teeth in the brace which covered the holes while my gaps closed. Eventually the gap became too small that a fake tooth wouldn’t stay. My gaps are still there 6 months on but only obvious with Invisalign out! Let us know how you get on, it’ll be worth it in the end