Good advice from Wes & Donny.
Proceed with caution, but you might try doing the movement without any weight resistance at all. Only to get the feel of the exercise. All the while trying to extend the free hands out, for a full stretch, as far as possible (sort of like a martial arts training/stretch drill). If feeling a level of comfort, than try the movement with a light pair of DB's (5lb for example). As said before, this is more of a warming up/joint flex movement. This movement can be a part of anyone's warmup workout scheme if handled correctly. Like so many good BB'ing movement, it's not the amount of weight used, but how you control and handle each exercise done. In strict BB'ing light can do so much more than heavy with most exercises.
This exercise is affecting the shoulder girdle at a high percentage rate, so if any unusual burning feeling or click, than the rotor cuff is more than likely receiving undo stress and tension. Which raises the red flag to stop the movement at once. If feeling it in the elbows, than you are using way too much weight. Could probably do this 360 circle exercise standing up, but try keeping the DB's a little behind the straight line of the body. Something like a lateral raise, but going all the way up, meeting the DB's at the top together. Good Luck.
