Three main parts:
1     Intro and ryhthem drone chop:
      E-|-------------x---|   Heavily palm muted.  During verses let A string      B-|-----8-----------|   ring and fret E string with thumb over the      G-|-------------x---|   top (T).      D-|-------10--------|      A-|-------------x---|      E-|-----T-------x---|
2     Power chord crunch:
      E-|---------|           A major at the nut.      B-|-----3---|      G-|-----3---|      D-|-----3---|      A-|---------|      E-|---------|
3     Descending line in change:
      E-|-----------------------------------------------|      B-|-----------------------------------------------|      G-|-----------------------------------------------|      D-|-------7-5----7-5----5-4----3-2----0---0-4-5---|      A-|-----0------0------5------3------0---3---------|      E-|-----------------------------------------------|                                                 etc...  continue                                                 from open A string.