I don't know how exactly to explain it, but I'll give it a shot.

Pluck the breast feathers clean. Clip the wings off with scissors or a knife. Then take your thumb and find the bottom of the breast. Poke your thumb through the skin up under the breast, and then pull the rest of the bird away from the breast, like your going to pull the bird in half lengthwise from the bottom to the top. You can see the breast when you start seperating, and just pull it free from the rest of the bird, removing all the skin and washing to remove feathers.

Sorry I can't do any better, but it is just something that I have a lot easier time demonstrating than explaining.