well what I've been doing is, having my index finger on the fret hand where it's supposed to be on the string it's supposed to be, have my ring finger on the right fret and right string, and then the middle finger of my fret hand would be between the other two strings I don't want to sound, then I would make one strum and it would play only the two notes... and that's how I would play the song... but I've discovered finger picking to be much easier to do for this song, although trying to play the song with a pick really increased my fret hand muting skills as well as finger accuracy, coordination, etc.