Build your threat model // then get the plan that fits it

You do not harden against everything. You decide what you are protecting and who from, then do the work that fits. Answer five questions and this builds your plan: the measures that close your threats, ranked, each with what it costs you and where it stops.

The five questions are the Army's OPSEC process in plain language: identify what needs protecting, know the adversary, judge likelihood and consequence, weigh the cost. Privacy Guides asks the same five. "Everything is a trade-off. There is high security, but never full security."