I have 17 chickens (15 girls, 2 boys) and am considering getting 2 guineas next year. (Why? Because approx. 2 guineas per acre will eliminate ticks entirely.) The chickens will probably be about a year old if/when I get the guineas. So, if I do, how do I graft the guinea hens in? Nothing is set in stone right now, I just want a good idea of what's involved if I do get them. Thanks!