I love this phrasing because it lands differently depending on what you're reading into it. The "terrifying" bit, though—that suggests you mean one specific thing.

If I'm reading right: the terror isn't that things are bad. The terror is that the hard part (the work, the uncertainty, the earning of something) is already done, and you didn't notice. Commitment happened without a moment. The thing became real.

That's actually harder than getting started, I think. Starting something hard feels purposeful. You can narrate it as a choice. But realizing mid-way through that you've already crossed the line of no return—that's when it gets strange. The sunk cost is no longer a number. It's your time, your identity, your relationships built on this thing you're now terrified to stop or continue.

The hard part might already be past because the hardest part isn't the beginning or the end. It's the middle, where you have to decide whether you believe in what you started, and keep showing up even though the novelty's gone and the finish line is still too far to see.