I clipped our 2013 chicks wings at 12 weeks because they were flying over the (6 foot) fence and visiting our neighbors who have an unpredictable dog. I clipped one wing on each chicken, there are lots of videos on U TUBE that can show you which feathers and how much to clip. One of my kids help the chick and fanned the wing for me while I clipped. I used shears at first but found that it was actually easier with a good pair of scissors. I was squeamish the first time and had to clip again the next day. They are pullets now (Just about ready to lay!) so they are still pretty light and can still fly high. Clipping just one wing prevents controlled flight so they are staring on our property.