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A lot depends on the skill of the phlebotomist. I've found some to be excellent and some mediocre when I've donated blood. They each have their own little routine. When they use warm-packs, I think it's both to bring blood to the surface to find the vein and to keep it flowing once they start. None of them can ever find good veins in my right arm, no matter how much I hydrate, so I always donate from my left. It's too bad that I can't alternate.
I rarely see the same nurse twice but if you are at a facility with a smaller staff you might notice which phlebotomists do the best job and ask for them the next time. After months and months having blood taken regularly for CBCs, my wife learned who the best phlebotomists were.
An aside... Something I've casually wondered: If we spent our spare time using arm weights to build up our arm muscles, would that make it easier for them to find veins near the surface?
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