And never the same library. Probably change your hardware frequently as well or even use disposable devices. Also don't commute to them in a traceable way (no personal vehicle, no Uber, no taxi with credit card, no public transportation without mask to cover facial recognition + outfit changes).

Real "vs. NSA" security is nigh impossible right now for any persistent operation. Especially given ARGUS style eye-in-the-sky citywide object tracking.

Maybe the most successful model would be an actual homeless person who wanders by walking and hitchiking and never sleeps in the same area twice.