I'm a O neg so I try to donate at least kind of regularly, but I had an operation right after the first of this month so I'll have to wait a bit. At least every other time I donate they have to probe around to find the vein. I have decided that when I sign in I will insist on getting the most experienced sticker they have, even if I have to wait. Then if they still can't find it quickly I'll have to make a decision.