One of the many, many, many things I love about Christmas is that you can unselfconsciously use as many jazzy chords as you like. So I take every chance I get in this arrangement to use the devil’s interval and bust out my favourite turnaround chord of all time: the +5. There’s the G+5 (0332 and 0576) for most of the turnarounds and a C7+5 (3443) to introduce the key change in the “…” section.
This arrangement uses mostly strums. Generally, wherever all strings are notated you’re strumming and otherwise you’re picking.