I just started this wall a few weeks ago in my free time. I've had a lot of people ask me if I could repair there existing stone walls and I always refer them off to a local company. however I figured I would try building a wall where I live to get some ideas and practice. I've been using straight portland and brick sand. Ever once in a while I pick up a bag of masonry type N cement and use that which makes things a little bit easy. But just tell me what I'm doing wrong and maybe some different ways to approach things. It is a solid wall mostly made out of stones I got from a horse farm.