Clipping is easy, Just cut off about 1/2 the primary flight feathers using a pair of shears.
I don't like to clip the wings, personally. With my Doms, I have to be able to identify potential breeders, and with clipping, I lose the feather on the wings. SoP thing. I will finish the rest of the yard tomorrow.
Yes, wing clipping is simple, but I also don't like doing it, because there may be a time they need to be able to fly up to the top of their 6' run to evade a four legged predator. Flight is a bird's only defense against a larger predator.