Saw a couple versions of this song online...
The part i have trouble with is remember playing '2 sets of strums' or '1 set'. I label them as slow or fast (where slow means you are playing 2 sets of strums).
You can kinda figure out what 2 sets of strums means when you hear the song. Its just a collection of playing the chord a few times the same way (aka a bass note followed by strums, followed by another bass note and strums like Iz plays it).