The melody of How Will I Know by Sam Smith runs 333 notes across 71 bars, 3:54 long in C at 82 beats per minute. The tab sits almost entirely in the first two frets, 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? How Will I Know chords and lyrics.