Its 8 bar blues hella fun.
Play this 4x for the intro and than 8x
G——————————————————————
D——————————————————————
A—3———————3————————————
E———2—3—6——————————————

Then change to this 4x

G——————————————————————
D—3———————3————————————
A———2—3—6——————————————
E——————————————————————

Back to this 4x              Then the big change.
                              
G————————————————————        G———————————————————————
D————————————————————        D—5———————5—3—5—3H5—3———
A—3———————3——————————        A———4—5—8———————————————
E———2—3—6————————————        E———————————————————————

I dont think the change is the same as in the song, but this way sounds 
better to me and its more fun.