More specifically, you can try chasing him from the coop as soon as you enter. Bring a broom or something. If he tries to come back in while you are doing your chores, shoe him with the broom. Feed your girls and elt them eat and stuff and you be around them showing the rooster you are the boss. When you are feeling comfy, let him back in. If he goes for you, chase him back out, If he ignores you, you are making progress.
Other people suggest when he comes at you to grab him and sort of hold him on the ground a minute. Let him up. Repeat until he ignores you. Others carry them around like footballs.
A quick use of the forum search feature will yield you many results on the various opinions of taming down a rooster. Good luck with your bird!