: Use strict index-middle (1-2-1-2) alternation. To manage the skip from the G string to the A string, your index finger should begin moving toward the A string while your middle finger is still striking the G string.
: Turn your amplifier volume up and play with a lighter touch; this prevents your plucking hand from tensing up and tiring out too early. Core Musical Theory C'mon Girl
If you'd like, I can help you with more specific parts of the song: by John Frusciante Finding a slowed-down backing track for practice Music theory analysis of the chorus's chord progression : Use strict index-middle (1-2-1-2) alternation