Take Keys

Here are the key drawings from the in-class demo that I did.
This is pose A, the first key drawing. You'll want to have a 2 second animated hold at the beginning of the scene, so trace back this drawing twice. Number the drawings 1, 1a, and 1b.

Shoot them as a cycle for the 48 frames
This is pose B. This is an anticipation down.

Put in two inbetweens; a half and a quarter into this pose. This will be key #4.
This is pose C. This is a slight anticipation to the right in preparation for the big head turn to the left.

Put in one half way inbetween from the last drawing to this one. This will be key #6.
This is the breakdown drawing. It is a half way inbetween.

You can use this type of inbetween with an additional inbetween as a quarter into the next key, then shoot the two inbetweens on ones. The only problem is that it may pop a bit because of the large distance.

Label these two inbetweens 7 and 7a.

Be sure you have a downward arc to the path of action, otherwise the head turn will look flat.
The alternative to the above inbetween is to do a strobe, where the drawing shows multiple head positions as shown in this drawing. It's probably better to use the strobe as the action is so fast and the distance is pretty big. Use just the one inbetween and shoot it on twos.

This would be drawing #7.
This is pose D. Label this key #8.

This is the extreme head position to the left.
This is pose E. This is key #10. Inbetween this the same way you did drawing #7.

The head position on this key is slightly higher than in drawing #6. The hand positions should stay fairly static as the head turns take place.
This is pose F. This will be key #12. Again, inbetween it the same way with the strobe action.

This key position is also slightly higher than drawing #8.

If you really wanted to, you could add in two more keys of the head moving to the right and then the left again before going into the final take position.
Pop directly into this position without the strobed inbetween to make it hit harder.

This is pose G. This was the first extreme take drawing from the demo.

I then took another sheet of paper and pushed the pose to more of an extreme position...
and here is the final drawing.

Now you can certainly go even further than this if you want to.

You can alternate between the two extreme positions to create the stagger take effect.