Start off doing an Idle. When the devilstick is being
passed from the left handstick to the right handstick, start bending over to
place your neck in the middle of your handsticks. When you then pass the
devilstick back to the left handstick roll it over the back of your neck,
which should be in between the handsticks. This is very similar to the
Leg Roll Over trick.
In the picture I have just put the devilstick on the back of my neck with the right handstick. After it rolls off I will catch it on the left handstick.