We have just cleared the surplus roosters from our lastWelsummer hatchings, the pullets are close to laying, I take them out early AM before they have eaten, and while still perching. As I remove them from the coop, I break the neck using the "strech and twist" method-hold the legs firmly in right hand, hold head as described by ZacB, then in a single motion, I pull and twist the neck, all over in seconds, then bleed usually in a cone but don't have one at present so dropped them into a plastic drum to contain the flapping. The neck breaking needs to be demonstrated and learned under supervision, I learned from my granparents while at school, but have taught several smallholders the technique over the years.