how do you let go?

I have seven RIR pullets, they are about 7 weeks old and cute as buttons. They are pretty friendly for chickens, and hang out around the porch all day, and free range through the yard all day and are smart enough to stay under cover -- though I have a lot of trees and bushes to help that. The problem is that I really only wanted 3 RIR. So I would like to let 4 go. I have 3 Red Star, and 2 Americana, and 2 Black Star and 1 Buff orp. And with those 8 and the 3 RIR that makes 11 and that's enough chickens for one person. But they are like puppies and look at me as a mother, so to speak, and come running when they see me and like nothing better than to sit on the porch steps when I'm working on my computer (I'm a programmer) and stroll into the house and hang out in the dining room. (though I shoo them out again) Practically speaking, I think it is better to sell four of them. But how do you let go????