Resiliency is about preparing for a future where you'll be stood against trouble. Let's focus this conversation on a tool-set we already use; forcible entry.
The hardest part of growth is finding out you're not as good as you thought at something. After that, it's just a matter of time, effort, pace and cadence to get better.
One thing this field manual - and it's written like a field manual, more on that later - it has specific notes. From equipment considerations to defining search techniques.