The shift: from "do people like it?" to "does this problem hurt?"
You owe your idea a harder test than your own enthusiasm before you spend a single evening building. Most solo products die not because the build failed, but because the problem was never as painful, or as common, as the founder assumed.
From Spec to Stack
You treat the spec as a contract with your future customer, then open a code editor or a blank Bubble canvas and assemble everything at once: the landing page, the database, the login system, the AI feature, the email receipts, the dashboard.
Demand Is Borrowed Before It's Owned
Your checkout link works. You've paid yourself, watched the deliverable arrive, and confirmed the refund.
A signal is a pattern, a verdict is a story you tell
Seven days after the link went live, you're staring at a dashboard — three sales, one refund, forty-one clicks — and an inbox that's mostly quiet. You learn to tell the real pattern from the story you're tempted to tell about it.