you guys!!! use method 1. it is on level 2-1
stay in that corner, and when they get ALMOST level with you, bite and they will get scared. move over their head and press A ONLY when you are in a confident position in the air. this will automatically make you hit their head. rinse and repeat.
dont bother counting because you might as well make this go as fast and as easy as possible and counting really won't help that much, it will just make you more nervous at the end.