The melody of She Looks So Perfect by 5 Seconds of Summer runs 383 notes across 109 bars, 2:44 long in E at 160 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? She Looks So Perfect chords and lyrics.