If you have a choice, ask to have the most experienced technician or nurse draw the blood. I have learned first-hand that the "specialists," the ones who draw blood many times per day, do a better job than those who draw blood only occasionally. There is less discomfort, and more chance of success on the first try, when you have an "expert."
I don't know what they do differently, but there must be some skill and technique to it that makes them better from practice.
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