No, you underestimate that. Being prepared is increasing your chances. There's one thing to be lucky as "1 in a billion" chance, and there's another to be lucky as "1 in 100"; the odds are always stacked against you, but with preparation & many attempts, your odds start looking better, and "luck" starts happening. (or not; some people are indeed unlucky, despite doing everything right. But that's less common than the other extreme - people that get lucky despite not doing anything rights).