You still want to be thoughtful about what you do, no doubt, but you have to learn through trial-and-error experimentation as well.

I have a fear right now that what I call the advertising-narcissism complex is sucking up way too much top talent.

There is what Steve Blank calls the stage where you are searching for a scalable business model. Then, there is the stage when you have found that model and need to scale it. In the former stage you have to have a "beginner's mind," be in learning mode, and expect to learn things you didn't anticipate.

Every leader needs to watch what teenagers or startup companies - or startup companies headed by teenagers - are doing today, because many of those behaviors will be mainstream behaviors tomorrow.

In the strengthening the core job, a leader can draw on their past experiences. After all, in most cases they did the job of the people that are reporting to them! So they know when something is screwed up, they know the risks worth taking, and they know the corners to cut. But when they are creating the new, no one knows what the right answer is.

First you document your idea. You should be comprehensive, but that doesn't mean you have to produce a doctoral thesis length plan. Rather you want to make sure you have touched all the different things that have to happen to succeed. Then, you evaluate your approach. The goal here isn't to figure out if your idea is good or bad, but rather to begin to figure out what are some of its weakest elements.

Of course, it is worth it to take the time to think carefully through your assumptions, and ensure you at least have hypotheses around how you will create value. But use the analysis as a way to focus attention on the most critical assumptions, rather than spend a ton of time massaging the numbers.