I'm preparing for a talent show coming up, and I'm planning on playing "Master of Puppets" by Metallica. I've been practicing the hell out of this song for months, but I can't seem to get the down picking right, cause at the end of the song it seems I'm just worn out and my timing gets sloppy.

Does anyone got some drills for right-hand endurance I can use to get this thing nailed? :confused: