Every individual practicing total sovereignty on themselves. That's what it is, you nailed it.

You only need one thing to do it: wanting to do it.

How is it done?

Do not accept any imposition.

Do not accept that which violates your free will.

Do not violate others' free will.

It's that simple.

Anarchy is a state of mind. When enough people share that state of mind government simply disappears.