Melholly, Definately take Fleecwife's advice - watch someone else do it,
several times before having a go. Look in the internet for video demos as well.
Even so, the first time you make a sheep's foot bleed you will have a shock because it will bleed BIG TIME -even for the tiniest nick!!! I mean it drip, drip, drips, like crazy!! You are left holding this foot as the ground quickly goes red, and you know your first aid kit with the bandages and the suture set are in the house, and the ground is all muddy, and if you let it go what if it gets infected..... OK so that sounds awlfully melodramatic, but its sort of true!!
I hate making them bleed, so much so that i went and got this special glue which orthopoedic surgeons use to glue the skin together after a hip replacement. Its great. stops the bleeding quickly, and has antibiotic properties. I also used to use a dog bootie...when i was younger and paranoid...
At least, if you have a few lessons from someone else, you know you are only going to do the minimum of harm when you do make a wee mistake!!
Emma T