1. Skin the head if you didn't in the bush.
2. Get a long thin 'steak' knife up into the brain cavity and smoosh it around in all directions to get ALL the brain material out. Twist and pull the knife out slowly as you go, this will help to wrap the brain casing around the knife & remove it. Most of the brain will just run down the knife blade & out.
3. Boil it in a big rectangular pot, cover it to just up to the coronets, not onto the antlers as the rendered fat gets all stuck in the bases. Once boiling turn it right down to a gentle simmer for 3-4 hours.
4. Pull it out and pull off all the meat, take special care at the back of the skull as there's lots of attachment points that hold meat & cartilage. Use an old wire brush if you've got one.
No need to remove the fine bones inside the nose, the meat in here usually dissolves during the second boil.
5. Clean the water & repeat. Add some of the wifes oxy-action type soap powder or nappysan or maybe dishwash liquid to both boils too.
6. Go to the chemist and buy 1x 100ml bottle of 6% Hydrogen Peroxide. Brush it on the skull and leave
in the sun to dry. Don't get any on your clothes or the antlers! Repeat until it's as white as you'd like it. Usually 2 or 3 coats is plenty.
7. To get a professional look, give the antlers two coats of Danish oil. It gives them a 'wet' look and really brings out the colour.
8. Hang on wall, open a beer and admire your handy work!

Here's some past & present attempts:

Wanganui 12 Boil-Up. Note: Too Deep! don't cover the coronets.

Two from this years Tararua Roar, young 6 & older 4. 12point Wanganui 2012, random Fallow.

This years (Work in Progress, still discoloured), two coats peroxide, but overcast (no sun). Works much better with UV i.e. sunlight.

Finished 12, 3 coats peroxide (in sunlight) & Danish oiled. (Also 3yrs more daylight).

The 12 also carried a much much bigger skull, and was a huge stag.