well, tune your guitar to a drop d tuning.
if it's at standard tuning, it still sounds okay when you play it.

D 0--------0------
A --0--------0--3-5
D ----0-2-4----0---
G -----------------
B -----------------
e -----------------

and then

D 0--------0----------
A --0---------0-----3-
D ----0-2-4-----0-3--0
G --------------------
B --------------------
e --------------------


and i think:
verse:-
D, A, G
Bridge (and i am reaching...)
Em,c x4
(just tryin not to...)
G, D
Chorus
play (G) until you hit 'fear' then you change to (Em)until you reach 'tumbling'. then you change to (C) and change to D just before 'i'd be a fool....'

i sounds correct but i don't whether or not it is.. but the intro is 90% correct.. pls let me know of any corrections. and pls listen to the song for timing.