If your good at tapping Eddie Van Halen style (right hand tap pull-off to left hand index, hammer with left hand pinky) this riff will be a breeze. There are two wide stretches with the left
hand that can be tricky and your always starting on the string with the tapping hand. What I've done here is tapping major and minor arpeggio's that comprise the chord progression Emajor,Bmajor,c#minor,g#minor,Amajor,Emajor,Amajor,Bmajor.
You can loop the riff at a slower tempo to get the basic idea but
this riff definitely sounds best when played at a high tempo.
Here's a link to an mp3 example click here