I doesn't hurt them if you do it right. I have someone hold the chicken with a towel over its head while I stretct the wing out and clip its feathers. If you use sharp scissors it is fairly quick.
There are other videos on you tube about this as well. I have read from other people that when it comes time for them to molt, you may have to physically help to pull those clipped feathers out, but I don't really know.
I dont clip my chickens feathers and the free rage, fly some short distances, but there always in their coop at night. Once, a hawk dived down into the play area the chickens were in, and they were able to fly away in time before the hawk got one, so it does help for them to be able to fly if you are letting them free range.
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My white leghorn rooster is the same way. I even tried clipping just one wing, but he still gets out so I don't even bother clipping him anymore.