The last one I did went like this.

Skin head immediately after kill.

Soak in water for a day or two(until I had time to simmer/clean).

Simmer for an hour or so and then pressure wash. Repeat a couple of times. The pressure washer works great(just be careful), I will never do another one without it.

Lastly, soak for a few days in the 40 proof hydrogen peroxide.

Rinse.

Air dry few a day or two.

Hang on the wall.