As I said, pathwalking tends to be a term we use in Northern Tradition Shamanism. If you aren't familiar with that, you may wish to become familiar with that first. And I would probably also recommend trying to learn about projection in general before attempting pathwalking.
In that link I provided you, I describe what pathwalking is. To summarize, it is a form of projection that tends to be used by those who find themselves to be too grounded or centered in their physical bodies- unable to fully project for whatever reason. I said something along the lines of, "Your physical body walks in your home world, while your astral body moves through the second world... Some would say that Pathwalking is actually harder to achieve- as the person who pathwalks must have an awareness of their astral body (or hame), be able to work with energy and visualize it, and multi-task like crazy (moving both the physical form and the astral form in unison)".
If you continue reading, I also address the issue of learning pathwalking and why someone else cannot teach it to you: "Largely, pathwalking is thought to be spirit-taught or something that a practitioner learns on their own. There isnt a way to pathwalk that is set and stone, and no one can quite teach you exactly how to do it. I would say, however, that pathwalking largely can be achieved through guided-mediation and visualization techniques. The easiest way, Ive found, to start learning pathwalking is to simply get up and start walking around. Practice achieving a meditative state while moving, from there practice achieving that same state while physically walking. You should work towards being able to keep your attention both on where you are physically going and the state of mind you are working towards achieving.".