Not sure about the original version (never heard it), but the Cake version is quite easy to play on the guitar, with the following chords:
Am
At first I was afraid.
Dm
I was petrified.
C
I kept thinking I could never live
G
Without you by my side.
F
But then I spent so many nights
B
Just thinking how you'd done me wrong.
E
I grew strong.
E
I learned how to get along.
The chorus and bridge also follow this chord progression.
The bass line is a lot more intricate, with the bass playing scales of the above chords. Add the trumpets, drums and vocals, and you have a pretty damn good song.
For a little bit of trivia, the beginning of "I Will Survice" (Am, Dm, C and G) is exactly the same as the main riff in Guns N' Roses - Don't Cry. Who would have thought that's this is a popular chord progression? :-) | 
