Just for the heck of it, try tuning a guitar that way and then strum it a few times.
If you can do that and NOT want to keep learning the song I'll be very surprised.
You can see in the video above that open ringing strings is a huge part of the whole thing.
Hey, I got a thumbs up! Bet it was for my singing, ha, ha! Even my mother said after seeing this, "can't you find someone to sing and maybe play a drum?" Seriously, she said that!
Never tried to learn it but decided to give it a go. I just looked at a tab and it says he used a different tuning live, a whole step higher ("Good luck Robert!").
Speaking of nerves while playing, watch the pinky of the guy's fretting hand in the video
above right about the 9-10 second mark. Dude's shaking like crazy inside!
He also makes a pretty big clam during the ending but he doesn't miss a beat and you'd never
know he messed up based on his face or body language. That's the way you do it!