If you want to explore Zen practice, sign up for orientation at a promising Zen center. In the question period, ask about Zhouzhou and his response to a question about the Buddha-nature of a dog. If you get a reply to the effect that it all happened far away and long ago, you have the wrong center. Keep looking for a reply to the effect that it is happening as we speak. Then you might be in the right center. Let the teacher convince you.