4 top front veneers need to be redone. Can the adjusting be done with no numb face or would it hurt too much?

provider "over adjusted" 1 - came out too short / with a gap in my smile. 1 best way to take off the veneers - is it painful? 2 better way to "adjust" the veneers? he placed them & said "we are a team" "you tell me how bite feels" + using the paper that shows bite marks & drilling. - this assumes i am capable of giving feedback when my head is numb - seems impossible to "go by looks" with hanging lip from Novocaine so you cant see my correct smile anyway! can the "adjusting" be done with no numb face or would it hurt too much? there has to be a better way?