They know we are nervous and carry on to make us stop! My groomer proved that to me with my Olivia. She does not utter one sound when she does her nails, but screams her fool head off when I so much as touch her foot when grooming. I have never cut to the quick...so I do believe they play us.
I use cat clippers ... they are much easier in my opinion. And, I only trim them a little bit once in a while if they grow quickly, since they are groomed every 4 - 6 weeks anyway. I would much rather my groomer do them.