Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
That "working through it" period is when you try out different processes and people, seeing what goes well or poorly, learning from the iterations, and moving toward the ideal systematic design. Even with a good future design picture in mind, it will naturally take some mistakes and learning to get to a good "then" state.
People frequently complain about this kind of iterative process because it tends to be true that people are happier with nothing at all than with something imperfect, even though it would be more logical to have the imperfect thing. That kind of thinking doesn't make sense, so don't let it distract you.