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.