That is the worst part of the Practical exam at ALL levels, the verbalizing. In order to be sure the examiner knows you are confident in your skills, it is in your best interest to verbalize as much as you possibly can. I really feel that is the hardest part of Practical exams. It is easy to just walk in and perform the skill without talking, anybody can do that if you practice enough. But, to be able to talk your way through all the steps while doing them is a little tougher. In order to make sure that you hit all the areas, especially the critical criteria, verbalizing them will ensure you let the examiner know you know the skill.