Some where the OP mentioned field dressing. Part of the mentoring should include deer anatomy, find books with lots of illustrations both of the hunting type and biological. Depends on the particular kid but I have seen the entire range from utter fascination to about an equal amount of revulsion.

My dad was an MD and he made the field dressing into a Post Mortum and a dissection exercise. If you can get them to the point where they can name the major organs usually they will be interested in taking part. If not do not force them to do anything until they are a little older and make it a right of passage.

Don't forget the blood on the cheek or the Waidmannsheil right.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli