I'm new to having chickens, I rescued my f one in April, she was only 6 weeks old. She can be a brute! I have ear rings and i have my lip and a dermal next to my eye....She had to Explore ALL of them! My girl (Tilly) is a pet/house chicken, so I have hand fed her. She never pecks my hands for food. It was shiny things. But if she did, I would tap her beak and say NO! It seemed to work. She likes laying on my chest and she will take her beak and pick at my collar bone and neck...it looks like the same thing they do to dig in the dirt when they are taking a dirt bath. It's like she is trying to 'fluff' me up, so she can get comfy! She does HARD,and I blow on her head, and she stops! Then i make her get down. She doesn't do it that much anymore. And about chickens not being as 'trainable' as a dog or cat...i don't agree. I had never touched a chicken, let alone owned one. I rescued Tilly and thought I was going to find her a home....lol...yeah right! So I didn't know what chickens were or weren't able to learn. I just treated her like my other pets....chickens are VERY smart. I had her in a cage at night in the bathroom, which is connected to my room. I would bring her in my room in the morning and she learned to jump on the ground and go to her cage for food and water. She won't poop on my bed...She jumps down and will go to the 'puppy pad' I have for her! She sees me drink from my water bottle, and will run over and beg for a drink. So I take the top off and let her drink. I think if you handle them more and just treat them like you would a dog, you will be surprised with how much they learn!
Anyways, i hope this helps. And Good luck