I've spent endless hours plotting densitometer strips when that kind of procedure was warranted.
But split printing could easily be taught to someone who never even heard of desitometry, the zone system, or paper grades. One obviously needs a reasonably exposed and dev negative to start with,
but that's a different aspect of the overall subject. And a simple demonstration is probably more valuable than a book. Like everything else, it just takes some practice until you're comfortable with
it. But in principle, it's awfully damn simple.