I used a small hatchet..
Make a cut on each side, just inside where the horns are, then one at the front and back of the top of the skull.. Its just going to take a few heads until you've got an idea where the brain is..
After you make your cuts you can kind of pry open the skull top.. If you cut the right area it will pop off and the top of the brain is in there. Its inside a kind of sack thing so you take your fingers and use them to loosen the sack from the wall of the skull. there will be cord things from the back of the brain into the neck, and the some through the bottom. Use your knife or fingers to sever them and you can pretty much scoop the brain out whole in the sack.
Now laugh at how small animals brains are.
We're not sure yet if the brain has something in it like adrenal glands where adrenal glands from something large like a moose will kind of mess you up if you eat too much at once. Mabye the pituarity or hyperthalamus have a bunch of hormones where you might not want a big chunk of them at once.. just something to keep in mind.
and if you havent already, you cut the tongue out from the fleshy area between the two jaw bones, underneath. Skin it off and start drawing your knife along the inside edges of the jaw from front to back and chopping away untill you have it loose back as far as you can go and then cut it off from there.