I seem to have a hard time when it comes to people drawing blood from my arm! Some people hit it first try and don't fuss, and some, like last week when I had some drawn, had a heck of a time. She finally got a vein, and then only was able to get half a tube. Is there anything I can do to help them or prepare my body, like drink lots of water to help my veins become more visable??? It's so frustrating, because I HATE needles in the first place!!!