All good tips these guys are giving you. What I would do in your case. Since it is this one style giving you the most issue, I would take some home and work with it. Learning everything I could about how it worked. Yes carpet can have cross over rows. Normally at the point where the row makes the turn back you can find a row. As far to the part doing it in place or out in the room and moving it back, it is what you feel most comfortable with. No given rule.