Software is testing

Writing the first draft of a computer program is easy. It's the testing that separates the professional from a mere hack. Test and then, of course, make it better.

The same thing is true with:

Restaurant recipes
Essays
Web user interface
Customer service
Management techniques
Licensing agreements
Strategy
Relationships of all kinds

The reason it's so difficult to test and improve is that it requires you to acknowledge that your original plan wasn't perfect. And to have the humility and care to go ahead and fix it.

No fair announcing that you're good at starting things. The world is looking for people who are good at polishing them until they work.