Getting every drop out of the system, not just the obvious lines, before the first hard freeze.
Most of a winterization's value is in the parts nobody thinks to check. The faucets running dry clears the obvious lines, but the water heater holds a meaningful volume that never touches those lines, and low-point drains and traps exist specifically to let out water that would otherwise sit at the system's lowest points through the coldest part of winter.
Skipping any of that is how a split line inside a wall becomes a spring surprise — one that is not found until the system is pressurized again, by which point the damage has had months to do its work. In a state that reliably gets hard freezes, this is the maintenance item least worth doing halfway.
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