I've donated blood about two or three times, as far as I can remember. It does hurt, and sometimes they have to search for just the right spot, but my experience has been that after you sign in, they try to get it done as quickly as possible, and they're very kind to you during the process - sometimes they joke around, too. Also, they really fuss over you before and after; asking if you've eaten, letting you have snacks and water bottles, making sure you're sitting down and aren't dizzy. That's what my experience has been, anyway...it might vary depending on where you go.
_________________
I wish Sterling Holloway narrated my life.
"IT'S NOT FAIR!" "Life isn't fair, Calvin." "I know, but why isn't it ever unfair in MY favor?" ~ from Calvin and Hobbes