Good question, to be honest I feel silly for not including it as this is probably the hardest part, and largest hurdle to overcome.
I look at it like a card trick: Good setup, distraction and then fast reflexes.
You see the little bugger coming, or puffing his neck feathers then its time to act. Getting him early helps a ton.
Go staight for him with arms out wide and try to get him in a corner with only one way out.
Next you want to do something to distract him so he is intent on going one way, now its up to the quick thinking and fast reflexes.
Usually I have a broom or bag to distract him for kickers, then when he goes at it, or runs form it I come down from above. Dont try to go head on with a rooster, spurs suck.
Grab whatever you can or just push him to the ground and get a grip with the other hand.
Sometimes I have to hold the tail, and dont worry the feathers are strong enough, they wont pull out or hurt him much. Just be quick with the other hand to sieze him. No matter one leg or two pull up and get him upside down.
He will flap around and kick some, but not an attack kick, a looking for something to hold kick. Get both feet in one hand and push him down vertically so the head points to the ground. This shouldnt take more than two corrections and he will calm donw and admit defeat.
If you are responding to a kick or peck then go down from above, heck fall on him darn near, and hold onto anything you can. If you miss go to the chase and corner.
You can try to launch too. Dont kick him, but get under his body and lift the foot quickly, this will propel him up and away, or put him on the defensive and you can go back to the chase and corner.
The important part is to react fast so he goeson the run or defensive and dont give up. He is quick, but you can distract him and in no more than 3 tries get a good hold.
One thing that many do wrong is they try to grab too early from far away. That's what these guys were built for, getting away from a far lunge of an animal. They scuk at close range and any critter that eats chcikens can attest to that.
Get in there close, distract them and force them to go into your grasp.
Use anything you think can help you and go for it!
One tip is to practice with a flighty hen and get the grab range down before you go for him. Most of us are only half as skilled as our brains think we are, but if we have a try we learn quick how to make due with what our real abilities are.
Remember, use your height as an advantage and come form above as much as possible.
Distraction and herding him is a big part of a successful grab.
Try to break his aggression early, if you see any neck feathers go up then go for him first. That's what the big scary roo would do in the wild.
Good luck!
