In case you aren't into it yet... Let me warn you, it's VERY addictive.
First things first -you need to learn the dance moves. You can do that on your own. What I was trying to figure out was how to sing this. I'm not Korean, so it hasn't been easy for me.
In the process of learning more about PSY (yes, in all caps), I caught my mom dancing to it. She does not know she's on YouTube... yet.