Test out what works for you. Slowly ease into expected blocks. Quickly mumble through the total. Gently ease into the total as if you’re going ti sing it. Deliberately look and point at the screen the customer sees and read it out loud (reading a word makes me more fluent). Look directly at the customer in the eye and say the total. Don’t look at them in the eye. Honestly, test out any combination you think will help. Don’t put yourself under pressure, it’s not rocket brain surgery. Customers aren’t paying attention and just want to finish and leave.