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M46-52 harmonics can be skipped if you like, simply play naturally.
To play harmonics pluck lower two notes with p and highest note with a, damping with i to produce the harmonic - for last thee chords damp the missing string in the bass part of the chord with spare finger of lh to use the same technique.
Tricky at first, but try it, it's not as difficult as it sounds.
M133-141Triplet Rasgueado here simulates tremelo on Piano (originally composed for Piano), Can be replaced with tremelo playing an arpeggio on bass notes of chord through the tremelo section (Julian Bream does this).
M149-155 Another Bream variation is to play the harmonic section again here.