capo 4

most of the time, alternate these two chords
x5403x
5x403x

then use normal G, A and D
as in

G (320003@1)                           Dsoar (xx0232@1)a little longer than the best
          A (x02220@1)            Dleave (xx0232@1)you worries in the past

see video for details
http://www.youtube.com/watch?v=-_zUTp4_LsQ

the main picking pattern comes out in the alternating D chords (first two that i 
don't know names for). easily found.