The learning the basic approach is easy: doing the work is hard.
I think many people are drawn to Dan's approach because it IS easier, but it's not necessarily the way many people need to heal. If you watch his daily videos and his guidelines to the work he offers vs the success stories he also posts in videos, you will notice a big different.
Many if not most of the success stories are not from his own clients, but from people who outline the work they personally did which almost always is more involved than the approach Dan offers. This is because as the person learns along the way, they recognize what they need to personally implement to heal. I love Dan's perspective on mindset - that you need to look for successes instead of constantly dwelling on your "failures" to improve, that you need to begin moving and get back to life, that you need to learn to stop and take a few breaths and enjoy the world around you. His messages about how the nervous system impacts your ability to lower symptoms are right on, to focus on the psychological but he only focuses on the immediate psychological effects of the pain...and he absolutely avoids the longer term inner work and personality involvements that leads most of the success stories he posts. That is more complicated and very personal, and it's not his space in the TMS world. But by posting those successes, he is acknowledging that it's path many people need to take.
Look at your personal desire to simplify things and look at which parts you find the most difficult to deal with that seem "complicated" and I guarantee that is exactly the part of healing that your TMS brain is avoiding...and that is exactly what people are saying when they say this work is "hard" - they are not saying it's complicated. They are explaining how difficult it is emotionally and mentally to do this work because the symptoms are only a side project of the brain to the real crux of TMS.
Take a look once again at Sarno's personality traits: black and white thinking is one of them, as is perfectionism in all the ways it disguises itself and creates immense integral self-pressure: which in turn creates the unrecognized and burried rage he says we need to examine in ourselves.