First time I did it by myself and I used the shake and bake method. I put dusting powder in a large heavy duty black trash bag, put the chicken in with the head out and one hand in while shaking the bag. It was ok, but couldn't see very well if I had missed areas.What method do you guys use for dusting chickens? Mine are not as cooperative so this will be interesting.
Now I grab the bird, flip on its back while holding the legs together, and shake my duster can to sprinkle some on and then set the can down and rub it in. Flip bird upright while still holding the feet and do the back half. Let bird go. I did my whole flock of 21 in about an hour by myself, but that includes me chasing them down in a huge pasture. Without all that chasing, probably about a min per bird.
I've tried diatamaseous earth, but let's face it, it just did nothing for my bug problem. I now use a garden and poultry dust which you can get at tsc or on amazon fairly inexpensive. It did the trick.