If you have skinned any other kind of animal, the process is rather similar.
It is also quite similar to skinning after plucking, except that you still have feathers on the skin. The feathers make it a little harder to see what you are doing, but I feel that they also make it easier to hold onto...
Do you use the axe very much? You might start by practicing with the axe you already have, on things like sticks or cornstalks. They are not exactly like chicken necks, but they can provide good practice in hitting the spot you are aiming at.
If the axe is too heavy for you to comfortably use...