You're likely not yet an expert. That's okay. There will be times when you may become stuck or doubt the benefits of TDD. Fret not. Reading this book has been but a step on the journey to becoming a TDD master. The road is long but well worth the time and effort devoted to this journey. You are a professional, a craftsman devoted to your trade.
By now, you should feel confident setting up your development environment. You can configure your IDE of choice to run your suite of unit tests. You should be comfortable with choosing a test runner and the specific nuances and features involved in that choice. And, of course, you know how to assemble a comprehensive set of unit tests.
You can grow an application guided by tests. Refactoring should now be a breeze as you have the confidence to move code around without introducing breaking changes. You can...