Nice post zman.* z's correct the kind you buy aren't blood suckers.* They're ribbon leeches.* If you are worried at all about them grabbing on, just hold them so their sucker will latch onto your fingernail.* Then, you can take all the time you want to bait up.*
P.S. I'd worry more about tetinus because you got so worried about the leech that you went and stuck yourself with the hook while baiting up.*
Me personally, I hurt myself so much, my tetinus booster is always up to date.