It will be easiest well after dark. Keep the flashlight dim and pointed away from an avenue of escape. Give him water in cage, I withhold feed to purge intestines but slaughter by 9am....last meal of scratch 15 minutes before kill to fill crop making it easier to remove.I am going to do it tonight when the sun is beginning to set and I can pick him up off the roost.
Good Luck...you can do it!