I waited a week before buying the dlc so I was late to the oryx raid. I spent a day going from group to group just trying to learn the fight. I joined at every checkpoint, and by the time the group inevitably fell apart I learned that part of the fight well enough to join a group that knew how to do it. That's called progression my dear friends. Go in first with the intent to figure the fight out instead of trying to find a group to carry you.