Or put any other band you like.
I mean, I’ve been playing for quite some time (15+ years, I’m 30 now). My strength is my knowledge of music theory; my weakness is my guitar playing. I never could play fast. And I did practice on small things for hours, for months.
I figured it might be because I’m a real lefty, and I play right handed. Some time ago, I decided to start all over playing left handed. My left hand as the picking hand is so much more controlled and has a lot more endurance and can be fast, and I’m just starting... It’s so odd, but it might make sense. My right hand, now as the fretting hand, obviously needs time, and it will probably take some years to get somewhere, but I never had the control, I have now playing left handed.
I also got Rocksmith 2014 and a lefty Yamaha Pacifica guitar. I practice 3 to 4 hours a day (an hour of Rocksmith included) with sets of 30 minutes each.
When practicing, I just start strumming one string only (usually the B-string) in a constant motion and after a while I apply my fretting hand to pick something like 0-4-5 or 5-5-7-8 over and over. I like the 5-5-7-8, because I can use that fretting to play the “Blade Runner - Ending Credits” by Vangelis.
Then, I try three notes per string—or four notes (chromatics)—two strings only.
I seem to prefer circular picking or this turning motion of the wrist (rather than the vertical motion).