I’m A-. Gave blood a few times when I was younger and it was always hard because my veins don’t obligingly pop up. They just took a punt and stuck it in, and if that didn’t work they’d try somewhere nearby. The last time I had a few needle marks on my arm for quite a while, made me feel self conscious as I had to work in short sleeves, and I worked at the kind of place where teaspoons went missing on the regular, not a good look. Looking back I feel bad about being a wuss.