I have done a couple myself and a few things that concerned me;
First when boiling, the skull turns slightly yellow from the fat that is melted from the boiling process,
The brains are a pain in that most of them should be removed before the boil - Stick a bent coat hanger, bent hook on end, attached to a drill and churn everything up as best you can and then flush with some pressurized water.
Have been considering using a hole saw to open up the spinal cord channel for better access.
and lastly, be careful and don't boil too hard or too long or you will end up with the small bones at the nose to come apart or fall off.
These are the main reasons I can't wait to see the carrion beetles work.