The melody of Just Someone I Used To Know by Jack Clement runs 132 notes across 52 bars, 2:07 long in Bb at 110 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? Just Someone I Used To Know chords and lyrics.