I do write unit tests while writing APIs and core functionalities. But I want to be the cool fanboy who eats, sleeps and breathes TDD and BDD. What's the best way to get started with TDD/BDD the right way? Any books, resources, frameworks, best practices?
My environment is Java backend with Grails frontend, integrated with several external web services and databases.
Find someone that has been doing TDD/BDD and pair program with them.
I can't see that anybody has really expressed that TDD is not about testing. TDD-ing is about expressing the expected behaviour before doing the tiny behavioural-changing modification. This greatly improves design and enables focusing in a way I have never experienced before. You get tests that protects your future refactorings and 90% coverage for free.
To learn it I would suggest (summarising what others have said and adding one of my own):
I practiced the Bowling kata (exercise) on my own about 20 times (about 30 minutes apiece) before I started to see the light. Started out by analysing Uncle Bob's description of it here. There are a host of katas on the codingdojo.org site including solutions and discussions. Try them!