i think for this song your guitar is supposed to be tuned down a half step but i figured 
out in standard tuning
it starts with the little descending thing but u can barely hear it
also you can replace the bar chords with power chords

e|--------------------4--------------4--------------4----------------------|
B|--------------------4--------------4--------------4----------------------|
G|--------------------5--------------5--------------5----5h6p5-------5--4--|
D|--------------------6------4-------6------4-------6----------------------|
A|--------------------6--6-7---7-6-7-6--6-7---7-6-7-6----------------------|
E|--4444333322221111--4--------------4--------------4----------------------|

e|-------------------------------|
B|-------------------------------|
G|-4h5p4-------4-----5----5h6p5--|
D|----------------7--------------| then it goes to the good part
A|-------------------------------|
E|-------------------------------|

e|----------------------------------------|
B|----------------------------------------|
G|----------------------------------------|
D|----------------------------------------| 4 times
A|-------2-4-4br-4-2-4-2-----------2-4-4--|b
E|--4--4-----------------4-----4--4-------|

e|---4--------------4--------------4--------------------------|
B|---4--------------4--------------4--------------------------|
G|---5--------------5--------------5----5h6p5-------5--4------|
D|---6------4-------6------4-------6--------------------------|
A|---6--6-7---7-6-7-6--6-7---7-6-7-6--------------------------|
E|---4--------------4--------------4--------------------------|

e|-------------------------------|
B|-------------------------------|
G|-4h5p4-------4-----5----5h6p5--|
D|----------------7--------------| then it goes to the good part again
A|-------------------------------|
E|-------------------------------|

e|----------------------------------------|
B|----------------------------------------|
G|----------------------------------------|
D|----------------------------------------| 4 times
A|-------2-4-4br-4-2-4-2-----------2-4-4--|b
E|--4--4-----------------4-----4--4-------|

then theres a weird instrumental break that you cant tell whats going on so just play a couple G# chords
then basically the whole song repeats after the break
http://*
peace out