Listen to the song for strumming patterns; it's fairly simple when you hear it.  
Although there are 2 guitars they play the same thing the whole time (other then the verse).

INTRO / OUTRO
        E                         B      D#m     F#
|-------7-----7h9p7---------------7-------6------9-----12--12--11--11h12-------|
|-------9-------------9-7---------7-------7-----11-----x---x---x---x--x--------|
|-------9------------------9------7h8-----8-----11-----x---x---x---x--x--------|    1X
|-------9-------------------------7h9-----8-----11-----------------------------|
|-------7-------------------------7h9-----6------9-----------------------------|
|-------7-------------------------7-------6------9-----------------------------|
 
        E                         B      D#m    F#
|-------7-----7h9p7---11---7------7-------6------9------|
|-------9-------------9-----------7-------7-----11------|
|-------9-------------------------7h8-----8-----11------|   1X
|-------9-------------------------7h9-----8-----11------|
|-------7-------------------------7h9-----6------9------|
|-------7-------------------------7-------6------9------|


VERSE

Both guitars play at the same time in the studio version, 
but in live versions they usually don't play the guitar 2 part because Will is on the drums.

Guitar 1
         B       E
|------7------7------|
|------7------9------|
|------8------9------|        12X
|------9------9------|
|------9------7------|
|------7------7------|

Guitar 2
         B
|------7--------------------------------------------|
|------7--------------------------------------------|
|------8-----------------------------9------9-------|        12X
|------9-----------------9h11--9-9-9---9-9----------|
|------9----------9-11------------------------------|
|------7----9h11------------------------------------|



CHORUS

These two chords are just repeated over and over again.
       F#        E 
|------9---------7------|
|------11--------9------|
|------11--------9------|      4X
|------11--------9------|
|------9---------7------|
|------9---------7------|




BRIDGE

During the bridge the strumming switches up some times but it basically stays the same.
       B       E       F#        F#
|------7-------7-------9---------9--------|
|------7-------9-------11-------11--------|
|------8-------9-------11-------11--------|      18X
|------9-------9-------11-------11--------|
|------9-------7-------9---------9--------|
|------7-------7-------9---------9--------|

Song layout

Intro 
Verse 
Chorus  
Verse
Chorus
Verse- Play only 4X not 12X right before the bridge
Bridge
Outro