Easy song is easy 

Tuning: Standard 

Smiths riff for the entire song - 

 
E|----6---6---6---6---------------------| 
B|------7---7---7---7-7---7---9---9-----| 
G|----------------------8---8---8---8---| 
D|--------------------------------------| 
A|--------------------------------------| 
E|--------------------------------------| 
 

Listen carefully and there is an acoustic guitar strumming these chords throughout - 

 
E|----6-------7----9-----| 
B|----7-------7----9-----| 
G|----8-------8----10----| 
D|----8-------9----11----| 
A|----6-------9----11----| 
E|------------7----9-----| 
 

Perry plays something like - 

 
E|-------14----------| 
B|---14b------14b----| 
G|-------------------| 
D|-------------------| 
A|-------------------| 
E|-------------------| 
 

About halfway through, there's a nice little keyboard line that's easy enough 
To arrange for guitar - 

E|--------6------9--------6-----------| 
B|----7-9---9-7------7-9----9-7-------| 
G|-------------------------------8----| 
D|------------------------------------| 
A|------------------------------------| 
E|------------------------------------|