It is easier to catch them if they are not free range all the time, I had to enclose my chooks in a run for the winter and they have been more affectionate since in there. I read in chickens for dummies that the chickens expect predators from above, so reaching for the back will cause them to scatter. Take some treats in one hand one try to use the other hand to scoop in between the legs, grab both legs and hold until they stop trying to fly away and then you can hold them. This has worked with my birds, but in the summer when they free range all day they are tougher to get. I also try to make them sit on my lap for a treat, if I have time to chill with the chooks I take out some bread and whoever jumps on my lap gets some bread. Pretty soon a lot of the hens get to like being close to you, but I still have 1 roo that will NOT get near me. I can only get him on the roost at night and even then he is pretty elusive.