Based on this recording http://www.youtube.com/watch?v=lPF926pisrQ

Capo 5th fret, Standard tuning.

These are the shapes he plays, best playing it with fingers rather than a pick, and just 
play in usual Dallas style of hammer on's and pull off's. He lets the high E string 
ring out before the chord changes. Listen to the song to work out how to play it.

Verse
Am- (x02210@1)C- (x32010@1)F- (133211@1)C- (x32010@1)G (320003@1)I think the chorus is 
G - Am - F

Verse

Am (x02210@1)         C (x32010@1)                    F (133211@1)           C (x32010@1)  GWhat (320003@1)if I can't be all that you need me to be
Am (x02210@1)                         C (x32010@1)                                  F (133211@1)       C (x32010@1)  GWe've (320003@1)got a good thing going, we have some promises to keep
Am (x02210@1)               C (x32010@1)                      F (133211@1)            C (x32010@1)  GBut (320003@1)my addiction it can be such a detriment
Am (x02210@1)              C (x32010@1)                       F (133211@1)                 C (x32010@1)   GPlease (320003@1)believe in this my dear, I am more than penitent

Verse
What if everything's just the way that it will be
Could it be that I am meant to cause you all this grief
My war ships are lying off the coast of your delicate heart
And my aim is steady and true as it's been right from the start

Chorus
G (320003@1)                       Am (x02210@1)                 FThere's (133211@1)a degree of difficulty in dealing with me
G (320003@1)                                  Am (x02210@1)                                FFrom (133211@1)my haunted past comes a daunting task of living through memories.
G (320003@1)              Am (x02210@1)                           FIf (133211@1)we could, just hang a mirror on the bedroom wall
G (320003@1)                         Am (x02210@1)                  Fstare (133211@1)into the past and forget it all

Verse

So when we leave it'll be a quick midnight escape
We'll disconnect ourselves from all of yesterday
I'll dig for water and fashion our very own wishing well
Then we'll throw our coins down hoping to rid of us of this little hell

Chorus
There's a degree of difficulty in dealing with me
From my haunted past comes a daunting task of living through memories.
If we could just hang a mirror on the bedroom wall, stare into the past and forget it all