this song is easy-there are about 2 parts
tune your guitar down to drop C-

c
g
c
f
a
d

verse

d-------------------------
a-------------------------
f-------------------------
c-------------------------
g-------------------------
c---0---2---2---/9---/3---

chorus

d--------------------------------------
a--------------------------------------
f-------4-4-4-4-4-4-4-4-7-7-7-7-7-7-7-7
c-------2-2-2-2-2-2-2-2-5-5-5-5-5-5-5-5
g-------2-2-2-2-2-2-2-2-5-5-5-5-5-5-5-5
c---0---2-2-2-2-2-2-2-2-5-5-5-5-5-5-5-5

repeat as necessary

in the 2nd and 3rd chorus he plays this after the original chorus

d------------------
a------------------
f-5-5-5-5-5-5-5-5--
c-3-3-3-3-3-3-3-3--
g-3-3-3-3-3-3-3-3--
c-3-3-3-3-3-3-3-3-0

i think thats about it.  if im wrong please correct me.