You can use two shuttles and ball thread or three shuttles. It is up to you (A).
Tat both side of the pearl tatting without flipping the double stitches.
Tat 3 ds with shuttle 1 on the ball thread (B), then 3ds with shuttle 2 (C),
back to shuttle 1, you will end up with a picot to be able to tat the next 3ds (D).
Continue to swap between shuttle 1 and shuttle 2 to create a chain.