Very good. Though its not so much inhabiting a grain of sand, as inhabiting the very tiny layer of gas between the thin crust on a droplet of very hot liquid, and space. And the habitable layer of atmosphere, even the, fly in a plane, layer, is only about five to ten miles thick at most. Which in a planet of eight thousand miles diameter, is thinner than a layer of paint would be on a soccer or basket ball.

And we can not without a lot of technical help, even go a single mile down into the ocean, so we don't even manage to inhabit and use, one percent of this planet.