Fast iteration can make up for a lot; it’s usually ok to be wrong if you iterate quickly. Plans should be measured in decades, execution should be measured in weeks.
There is a filmmaker that worked for Pixar that put this beautifully, and he used the metaphor of doing anything difficult, but for your high purposes of building a company. He says, "If you're sailing across the ocean and your goal is to avoid weather and waves, then why the hell are you sailing?" You have to embrace that sailing means that you... See more
Did Steve jobs ever say, "Hey, I want to make a $100 million company?" That was never in discussion. He said, "I want to make insanely great products. Then I want to get really good at marketing because I want everybody in the world to have an Apple device, and the way to do that is to get really good at marketing."