You do not, I repeat, do NOT want to pluck or pull any of the feathers out, say with pliers or something. You need to cut the feather down until it bleeds a little, this wont hurt the bird, it will just deaden that feather folicle and its body tells itself to replace that feather. After you have done this wait a few days to a week and then pluck it, by that time the feather has loosened itself from the birds skin and can easily be pulled out, and by that time as well the new feather should already be starting to grow(although you may not see it yet). I have done this hundreds of times with my Cochins and Frizzles and have never had one take over 8-9 weeks to grow back in, and have never had any feathers that were ingrown. Im not saying it isnt possible, but its never hapened to me personally. And I have never done this to more than 3-4 feathers on each foot, and its usually the feathers on the outer toe that break the easiest, and more so on male birds then on females. Granted I have also never done this around showing season either. I would rather take a bird to a show that has all its foot feathers with a few broken, then take one who has missing feathers. As ultasol stated, judges look down on this, especially if the bird is described as having feathering on the entire middle toe. Thats just my experience in doing this, I can only vouche for myself, not anyone else. Hope this helps.
~Casey