Chris,
Certainly learning your gun and practicing with it relentlessly is key. No debate there.
But I disagree on one point... a weapon light. This is a HD weapon and the typical home invasion-type scenario is often in the dark of night. And unlike handguns, there is no way to hold a light while firing with a shotgun.
There is one thing that got drilled into my brain as a youngster "If you can't see it clearly, don't pull that trigger". There is no way to take it back and say sorry.
Practice, practice, practice is key for sure. And no accessory will replace that. But IMO, even a simple led flashlight securely mounted to your HD shotgun IS worth doing.
Hope this helps,
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MedB