Knowledge is the first-line treatment for TMS. Dr. Sarno captured this in Healing Back Pain, still his best-selling book when he divided the treatment chapter of Healing Back Pain into 5 subsections. They are very simple, and they explain how knowledge therapy works:
1. Think Psychological (i.e. explain changes in symptoms using psychological causes rather than physical ones)
2. Talk to Your Brain (i.e. remind yourself that you are fine)
3. Resume Physical Activity
4. Discontinue All Physical Treatment
5. Review the Daily Reminders (i.e. remind yourself of the TMS principles)
Note that all five of these techniques are about accepting the diagnosis and convincing your body that it is safe. Some of them are explicitly about accepting the diagnosis, such as talking to your brain or reviewing the daily reminders. However, if you think about it, "Think Psychological" and "Resume Physical Activity" and "Discontinue All Physical Treatment" are also about accepting the diagnosis. They are "knowledge therapy" to the core.
He doesn't mention journaling at all in the book - in fact the only time those letters ("journal") show up in the book are when he is referring to a scientific journal. He doesn't mention journaling because he encouraged people to see a licensed psychologist rather than journaling. However, he also mentions that 95% of his patients didn't need to be referred to a psychologist. (pp. 85-86)
Some people do a lot of emotional work and heal, others do no emotional work and also heal. Of course, the opposite also happens. Others do a lot of emotional work (or none) and don't heal. In the people who do do the emotional work, it can be hard to tell what it was that caused them to get better.
In my recovery, I know that it wasn't the emotional work because I didn't do any emotional work. I had done a lot of emotional work in the previous decades and have done more since that time, but around the time when I was healing, I didn't do any emotional work. For me it was just talking to my brain, resuming physical activity and discontinuing physical treatment. Likewise, if I remember correctly, Steve Ozanich didn't do any journaling and didn't see a therapist. He just kept at it with accepting the diagnosis and living a good life.
So I guess my position is that some people can definitely heal without dealing with the emotions. The first line of defense against TMS is definitely education. After you have gotten the diagnosis and know that TMS treatment is appropriate for you, my advice is to stick with those five steps in Healing Back Pain and you will go far.