Yeah, you just need a pot big enough to cover the skull with water. To help degrease you can also add a little dish soap to the water, but it will foam up.
The boiling will make it so the remaining skin/hair either falls right off the skull, or you can pull it off.
You will have to pull some of the meat/tissue/brains out/off of the skull, this is what I use the pressure washer for mainly. The pressure nozzle should work, but it might chip away the bone if it's boiled too hard.
Again, the boiling is something best done outdoors. It stinks.
I do know of some folks that don't want to bother with all that, and just find a big anthill to bury it in for a year, but you will likely get damage from mice & such.