From another thread:
@locket - I just started learning this song today. The trick to this song is clearly in the 1/8th note sections. The rest is just strumming quarter notes, which is pretty straight-forward I think. I also think the 1/8th note sections feel a bit harder, because we get stuck in that quarter note groove and the sometimes require string crossing. I personally am going to just take those 1/8th note sections on their own and practice them until I have them in a good place, then go back to the full song. I think that will do the trick for me personally.