I worked this out by ear, but its very accurate.
Everything's there, listen to the song for an exact order.
The timing's there mostly.
(note, there are four beats to a bar, hence 1 & 2 & 3 & 4 &)

Drop D tuning, high-low: EBGDAD

note, 'H' stands for 'hammer on'
eg:

 1     2
-----|-----------
-----|-----------
-----|-----------
-2H3-|-3H2-------
-2H3-|-3H2-------
-2H3-|-3H2-------

1) Play the E chord with your first finger and hammer onto
   the F chord with your second.
2) Play the F chord with your second finger and hammer off
   leaving the first on the E chord.
__________________________________

INTRO

This riff is played twice, with
1 bar (4 beats) of each chord:

 F                A
----------------|-----------------
----------------|-----------------
----------------|-----------------
-3--------------|-7---------------
-3--------------|-7---------------
-3--------------|-7---------------
 1 & 2 & 3 & 4 &  1 & 2 & 3 & 4 &

 F (octave)       E (ocatve)
----------------|-----------------
----------------|-----------------
-10-------------|-9---------------
-X--------------|-x---------------
-8--------------|-7---------------
----------------|-----------------
 1 & 2 & 3 & 4 &  1 & 2 & 3 & 4 &
__________________________________

VERSE

Note that two bars (8 beats) of
each chord are played:

 E (octave)       D (octave)
----------------|-----------------
----------------|-----------------
-9--------------|-7---------------
-X--------------|-X---------------
-7--------------|-5---------------
----------------|-----------------
 1 & 2 & 3 & 4 &  1 & 2 & 3 & 4 &

Every now and then, this riff is
thrown in between plays of the
verse riffs:

RIFF A

 A A#             A A#
----------------|-----------------
----------------|-----------------
----------------|-----------------
-7H8-8----------|-7H8-8-----------
-7H8-8----------|-7H8-8-----------
-7H8-8----------|-7H8-8-----------
 1 & 2 & 3 & 4 &  1 & 2 & 3 & 4 &

__________________________________

CHORUS

Each chord is played for one bar:

 A     F     D     E F E
-----|-----|-----|----------------
-----|-----|-----|----------------
-----|-----|-----|----------------
-7---|-3---|-0---|-2H3-2----------
-7---|-3---|-0---|-2H3-2----------
-7---|-3---|-0---|-2H3-2----------
__________________________________

RIFF B

This riff is used just before the
second chorus:

 A G A A# G
----------------|
----------------|
----------------|
-7-5H7-8-55-----|
-7-5H7-8-55-----|
-7-5H7-8-55-----|
__________________________________

END RIFF

This riff is a variation of the
chorus. Again, each chord is
played for one bar:

 A     D     A#     F E F E
-----|-----|-----|----------------
-----|-----|-----|----------------
-----|-----|-----|----------------
-7---|-0---|-8---|-3H2-3H2--------
-7---|-0---|-8---|-3H2-3H2--------
-7---|-0---|-8---|-3H2-3H2--------

After playing through the above
riffa few times, this is used to
end the song:

 F E F E  A
----------------
----------------
----------------
-3H2-3H2--7-----
-3H2-3H2--7-----
-3H2-3H2--7-----
__________________________________

SONG ORDER:

Here is the the order of the song
up to the second verse:

INTRO X2
VERSE X4
RIFF A X1
VERSE X2
RIFF A X1
VERSE X3
RIFF A X1
CHORUS X4