Rooster chicks appear to be friendly and cuddly...but they are not like puppies or kittens. And people new to chickens often times misinterpret rooster behavior. They see a rooster approaching you without fear, as a good thing. 'He likes me!" That is not the case.
Chicken society is based on a pecking order and when two chickens meet, one is below and one is above. Cockerels being raised in a flock mate society are often much bigger much sooner than the pullets. They become bullies, nothing is bigger than THEM, and nothing dares to thump him back.
Often times the darling becomes the nightmare. He is not afraid of you, so you must be made afraid of him, and he will attack to make it so. A good rooster gives me 6 feet of space, naturally. I would not keep a rooster that would approach me. It is experience I have had over decades of chickens.
If you read on this forum, you will find numerous stories where the darling becomes the nightmare. These are not people who mistreated or teased or handled his hens. These almost always are confident chicks that appeared to love people and one moment became incredibly aggressive.
Which I realize you did not ask for advice at all.
What you asked was how did I train the hens to jump in my lap. I went to the run with a book, and sat there, did not talk, did not pet, did not reach for them. I dropped scratch when I left. Next day same game, but I threw the scratch away from me, and sat until they had ate it all. Third day, same game, toss the scratch a little closer to me. Next day, but this time, they are approaching me, BUT DON't reach for them. Just sit quietly, and after a few moments when they start to leave you, drop the scratch at your feet.
Do not ever try and catch them. Just sit and watch or read. Eventually one will jump in your lap. Some do so readily, some never do so, depends on the bird.
I would NOT DO THIS with a cockerel in the flock. IF you have small children be doubly aware of the cockerel, they tend to attack children first, then women, then men. Inexperienced people often times vastly underestimates the violence of a cockerel.
MrsK