The trick to playing this song is to use slidable shapes: G#7 to G7, and D7 to Db7. The notes in the riff are very fast, but you can do it using pull-offs and hammer-ons as notated, and beginning with a quick down-strum on Cm. If you have a friend, let them strum the Cm so you can focus on the tune. For an extra challenge, try the alternative riff (written at the end) which jumps the octave like the original. With any luck you'll have the 10th fret marked with the third dot on the side of the fret-board, place your second finger on fret 10, and play the 9th fret with your index finger.