My best guess is that unless you started handling them as babies, it will be tough to start now. My three RIR's follow me like puppies, but they don't let me handle them (voluntarily). I got them at 8 weeks old, and they had never been handled. If you really want to work at it, try separating out a few birds and coax them with mealworms into letting you start stroking their chest feathers while they nibble from your hand. It won't work with the whole flock, since they'll peck and fuss while fighting for the handouts. It is also unlikely to work with just one hen either, since she'll be nervous by herself and be anxious to join the other chickens. I've eventually gotten a couple of mine to jump up onto my lap for a treat, but it takes a lot of time, patience, and repetition. If I get any more chickens, I'll probably start with babies and begin handling them from the start. Good luck!