First you will want to have a sanitary area to begin.
Step2
You will want to pinch the skin under the breast and tear part of the skin back.
Step3
Grasp the quail by its legs and use two fingers under the breast.
Step4
Grasp the breast firmly and pull the breast and legs in opposite directions.
Step5
The legs, back, head, and guts should all pull out.
Step6
Finally just take your game shears and clip the wings off, and give the breast a thorough cleaning. Once you clean a few quail you should be able to clean one in as little as 10-15 seconds!
Tips & Warnings
You may want to wear gloves for this although i prefer not to because the feathers tend to stick to them and get allover the meat.
As with any meat or poultry you should clean and cool it as soon as possible to avoid spoilage.