Intro

Guitar 1 - play this 3x                 on end of third time add this

 E|-----------------------------------------------------------------------|
 B|-----------------------------------------------------------------------|
 G|--1--0----4--3---7--6----3--3----------6-5---6-5---6-5--6-5--6-5-------|
 D|--1--0----4--3---7--6----3--3----------6-5---6-5---6-5--6-5--6-5-------|
 A|-----------------------------------------------------------------------|
 E|-----------------------------------------------------------------------|
Guitar 2- plays G maj chord notes here    Then C maj chord here and build it up

 main lick for chorus:
  B|--15~-15~-15~-15~-15~-15~-15~-15~

 and:

 E|------------------------------------------------|
 B|------------------------------------------------|
 G|-----------------------------------5---5-5-4----|
 D|----------3-------------3--------------------5--|
 A|----3-5-5---5----------------3-4-5--------------|
 E|------------------3-4-5-------------------------|

I'm back

I'm back in the saddle again
I'm back

I'm back in the saddle again

verse:
 E|------------------------------------------------------------------------|
 B|----------------------8---5---8--6--6--5-------------------------8--5-5-|
 G|---3---5--------------7---5---7--7--5--5---7----3---5------------7--5-5-|
 D|---3---5----3--4--5------------------------8----3---5---3--4--5---------|
 A|------------------------------------------------------------------------|
 E|------------------------------------------------------------------------|

 E|------------|
 B|--5-6-5-----|
 G|--5-5-5--7--|
 D|---------8--|
 A|------------|
 E|------------|

They play this part 4x on verse 1, then chorus, then 2x on verse 2 which
then goes into another similar riff on a different chord.
I'll be working out this part next, so that will be the next installment!
Also I'll try to tab out some of the solo licks at the end where Joe goes nuts!

The main lick in the end part goes like this for the rhythm guitar: 
 E|-----------------------------------------------------------------------|
 B|-----------------------------------------------------------------------|
 G|-----------5--4---2---0------------------------------------------------|
 D|--------------------------2--------------------------------------------|
 A|------------------------------2----0-----------------------------------|
 E|-----3----------------------------------3------------------------------|
                                              ^ This note is a G maj chord

Happy playing!