As with any transplant, I'd say it might be helpful to prepare yourself for the fact you'll have someone else's body part (I'll be celebrating my cornea's centenary before that long).
And don't have huge expectations for the result -- I can't comfortably read a book with my operated eye, though no doubt the vision would be acceptable with contacts. They're such a pain and the vision in my unoperated eye is still good enough that it's better to rely mostly on that eye than bother with them.
I still won't drive in the dark, won't play contact sports and my eyes get tired fairly easily, but overall it was a big win and I'd go for it again in a heartbeat. Good luck!
They're going to be aiming for a partial thickness graft, which is apparently much harder to do, but if they pull it off there's much lower risk of complications. Surgeon says his rate of achieving noticeable improvement in vision is 95% compared to the average of 50%.