Part 1:
E|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|----------7--------------7--------------7----9-10-10-10-12-12-12-|
D|--5-7-5-7-7-7--7-5-7-5-7-7-7--7-5-7-5-7-7-7--9-10-10-10-12-12-12-|
A|--5-7-5-7-5-7--7-5-7-5-7-5-7--7-5-7-5-7-5-7--7--8--8--8-10-10-10-|
E|--5-5-5-5---5--5-5-5-5-5---5--5-5-5-5-5---5----------------------|

Part 1 Variation:
E|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|---------------------------------------------9-10-10-10-12-12-12-|
D|--5-7-5-7-7-7--7-5-7-5-7-7-7--7-5-7-5-7-7-7--9-10-10-10-12-12-12-|
A|--5-7-5-7-7-7--7-5-7-5-7-7-7--7-5-7-5-7-7-7--7--8--8--8-10-10-10-|
E|--5-5-5-5-5-5--5-5-5-5-5-5-5--5-5-5-5-5-5-5----------------------|

Listen to the song and you can hear the difference.

Part 2:
E|-------------------------| ---------------|
B|-----------------------------------------|
G|-----------------------10-10-10-12-12-12-|
D|--5-7----5-7----5-7----10-10-10-12-12-12-|
A|--5-7----5-7----5-7-----8--8--8-10-10-10-|
E|--3-5----3-5----3-5----------------------|

I usually just slide between the G5 and A5.

Part 2 Variation:
E|---------------------------------------|
B|---------------------------------------|
G|---------------------10-10-10-12-12-12-|
D|----7-----7-----7----10-10-10-12-12-12-|
A|----7-----7-----7-----8--8--8-10-10-10-|
E|----5-----5-----5----------------------|

Yes this is played too. Let the first 3 chords ring. 

Part 3:
E|--------------------------------------------------------------------|
B|--------------------------------------------------------------------|
G|--9-9-9-9-9-9-10-10-10-10-10-10-14-14-14-14-14-14-12-12-12-12-12-12-|
D|--9-9-9-9-9-9-10-10-10-10-10-10-14-14-14-14-14-14-12-12-12-12-12-12-|
A|--7-7-7-7-7-7--8--8--8--8--8--8-12-12-12-12-12-12-10-10-10-10-10-10-|
E|--------------------------------------------------------------------|

The first three times you play it, play the G5s at the end, but the 4th time
keep playing F5.

Ending:

Play Part 3 twice, with G5 at the end each time, then play:

E|----| -----|
B|----| -----|
G|--9-| -----|
D|--9-| for awhile, then play -5-7-|
A|--7-| -5-7-|
E|----| -3-5-|

And here is the order:

Part 1 x 4
Part 2 x 2
Part 1 x 2 (YEAAAAH!!)
Part 2 x 1 (Singing Starts)
Part 1 variation x 1
Part 3 x 4 (At the end of this part the singing stops)
Part 1 x 2
Part 2 x 1 (Singing Starts)
Part 1 variation x 1
Part 3 x 4 (At the end of this part the singing stops)
Bass Part (No Guitar)
Part 1 variation x 2 (YEAAAHH!!!)
Part 2 variarion x 2 (More singing)
Part 3 x 4 (At the end of this part the singing stops)
Ending