Spare Me The Details

You do not need all this training and experience to be a good HM. There is a definite advantage to being trained in some field that requires organizational skills. The ability to think "on your feet" and prioritize tasks and issues is invaluable.
The idea is to break the "environment" down into smaller manageable pieces. At a macro level, the environment is all the places, people and things that are under the aegis of the principal(s). In other words, all the properties, staff, guests, pets, vehicles, etc. that the principals call their own. At some point, you will have to know the details of all these things; each seeming detail revealing that more information can be gathered.

Title by: The Offspring