Grab the chicken by its feet and slam its head hard agains a brick wall. This should break its neck. Then put your foot oon the head and sever it from the body witha hard tug.
Wait for a minute or two until the body stops pulling and wiggling and then hang it upside down by the feet. To drain the blood. Pluck with hard pulls. This is the most straining part.
Make a large cut across the chickens' poo hole and pull out the intestines. If you want to have a strange laugh, try reading the intestines;)
Clean out the inside. liver, heart, lungs and spine are eatable.
First time I did it took about half an hour and one hour of cleaning up the mess. I let go of the twisting body too early, result: blood all over the place. An experienced person can do it within ten minutes.
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Good luck, if you have the heart...