That Ah-hah moment is key, it becomes the vision and you the vision holder. You may see a need in the market that needs filling. Or, you see a success and associate it to your situation to the market you have expertise in where you can move your vision to reality.
Those who think they will become entrepreneurs, will have a hard time. As it is better to work from the vision and bring resources quickly into the new potential business. Ideation does help, especially refining a vision.
The vision holder is the key to success and needs tons of support.