How Do You Start TDD?

There’s a lot of talk about how you convert a legacy project over to TDD, and there’s a lot of talk about how you TDD on little code examples, but how do you get started on a real project? For a swing app, how do you TDD public static void main(String[] args)?

Atomic testing wants you to be able to mock out your dependencies, which leads to things like dependency injection. Somewhere along the line though, someone has to create those objects and pass them in. How do you atomically test that?

If I decide to use struts (or rails or whatever) as the base framework for a web-app, what tests should I have to ensure that struts is working as I think it should and to ensure that I know if something I’ve depended on changed in a future release?

I understand a whole lot about TDD and I’m quite comfortable sitting down with an existing code base and adding features via TDD. Despite that, every time I think about starting a new project and doing it right from the start, I just feel completely lost. I have no idea how I go about starting. Are there any good guides on starting a TDD code base? Are there any code bases out there that actual test everything that could possibly break or do they all have that one nasty bit of code that sets everything up and that we just can’t test?