Step 1: As your opponet charges, before they get close enough to attack you, kick them in the shin. This attack will either make the opponent bend down and grab his (the style won't work on girls) shin in pain or hurt them like crap. You best hope is that it makes 'em bend down.
Step 2: While they're bending down in pain grabbing their shins, you kick them in the head with your foot. This will result in them jerking their heads back when BAM! Step 3, hit them.
Step 3: With the opposite leg, knee them in the head. This will make them fall on their back in pain. Sprawled on the ground, you commence Step 4 on them.
Step 4: You make sure they're at least dazed. Then you get your dominant knee high (waist level) and make your foot come careening down onto their balls. In other words stomp on their testicles as hard as you can. This'll make 'em either grab their balls and wish they were dead or just make 'em pass out. From there, go for the kill.
Step 5: Either punch or karate chop (your choice) your opponent's lower neck. Depending on how hard it is, the blows could kill them.
And There you have it. The 5 steps to killing. Of course you could always use a gun....