“Hard-to-achieve things remain so until one of us chooses to take the chance and not give up.”

Difficulty is often just a record of who has tried so far. Plenty of things now treated as normal sat in the impossible column until somebody kept going long enough to shift them, and what changed was the trying, not the thing. Innocent gets there by the odds on Earth existing, which he puts at roughly one in eternity. If a single long shot produced everything alive, then not taking yours is the odd part.