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Roughly nine out of every 10 startups fail. Almost everything we read about entrepreneurship is written for that reality: how to survive the early days, how to find product-market fit, how to avoid running out of cash. Far less gets written about the one in 10 that actually makes it, and what happens to the founder once it does.I was sitting across from a founder over coffee, at a moment when everything in his business suggested lift-off. From the outside, it looked like success had already arrived. He leaned in and said that his company had raised $1 billion in funding. Coffee turned into drinks, and he told me something that few entrepreneurs have the guts to say: “I don’t really know what I’m doing. I’m not a big company CEO.”There was no performance in it. No false modesty. Just a clear admission that the job he had signed up for had already changed into something else.

That moment captures something most people miss about startups. Everyone wants to get in early, to be part of the story before it becomes obvious. The assumption is that success makes everything easier. In reality, success introduces a completely different set of challenges, many of which are harder than the early-stage chaos people romanticize. Here’s what to actually expect if your startup ends up in that fortunate minority, and how to prepare for it before it catches you off guard.Success changes the gameIn the early days, a startup feels simple, even when the work is intense. Small teams move quickly, decisions happen in real time and everyone has visibility into what matters. There is very little distance between effort and impact.