Yikes! That's a LOT of quills. I heard that cutting the quill helps "deflate" it and makes it easier to pull out. Having a couple people along makes the job easier as well, it would be a bi**h to do it all alone!
Springer, right? Can you control him so he works closer? (i.e. within sight) I don't know that much about the habits of porkies - as in how much time they spend on the ground.