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by xackpot 4849 days ago
I think there are phases of doubts:

Phase 1. Idea Strikes. Absolutely no doubts. The idea will kick ass and change the world.

Phase 2. Idea development, customer discovery. Doubt creeps in and starts to spread its tentacles. Now the numbers and figures start to play a role in the strength of the doubt. More optimistic figures weaken the doubt and fewer "likable" numbers strengthen the doubt.

Phase 3. The fight goes on. As orangethirty says: "Everyday".