In The Disbelief Habit, Chan explains how the inner critic is able to hurt you, and then proceeds with steps to help you mitigate those painful feelings. By becoming aware of the inner critic and what it is saying, you can be clued in to what it is trying to tell you. You can also question the messages that you receive. Just because you are saying these things does not necessarily make them true.
I liked the part about finding out that the inner critic is there to help you. It is trying to protect you, and by finding out how it is trying to be protective, you can better interpret its message.