Monkey say, good on you that man. I myself have (for a few years now) told myself that I'm going to start running, and have even targeted the Great North Run as my goal. However, unlike you, I've never gotten past this point.... One day... But good luck to ya I say. And if you accept bananas as sponsorship then come knocking at my tree...
Surely this would be far easier if you used, say, chicken blood? Or maybe the blood from an ox? Certainly less painful (unless the ox kicks you of course) and means that you're not whittling away bits of your own body. Don't forget that you can't grow a finger back once it's gone!