You'll learn to focus on the ones that trip you up the most. It's not so important that you can name and identify all 13 distortions as it is to recognize when your thoughts are really tripping you up.

For instance, one of my big cognitive distortions is thinking that I can't be open about things with my husband because I am afraid if he hears the truth, he won't be able to handle it. That's a big cognitive distortion in our marriage. Notice I didn't even label it. That really isn't necessary. What is important is that I realize this belief is a problem in my life. Then I can work on understanding that it isn't a rational thought, that I'm not responsible for his reaction, etc.

CBT done right will do this. You'll be able to focus in on the big issues in your life and learn to work with them. Try not to get too overwhelmed by all the labeling.