Earl Scruggs often played tunes in C shapes and used the capo to get into the key of D. That's exactly what you'll do here, if you play this in a jam or band situation. If you are just practicing on your own the capo is not needed.
The main arrangement strips down nicely with the difficulty slider. Even at full difficulty this one is pretty simple and is good for intermediate or advanced players who need a simple version to play at breakneck speeds. To add in some more variety, check out those licks.