[Koha] Borrower Catagories

[Lawrence Bean]

We are two small elementary schools setting up Koha, with the hopes of
eventually expanding it to encompass our entire school district (including
High School). Would some users who also do schools be willing to share, in
brief, how you have set up your "Borrower Categories", what that structure
does for you, and how easy/hard it is to make changes down the road?