Question: how to do a dme arc?
Answer: For all this to come out right, you need to keep the sequence straight: pick your next course by looking at the OBS dial at 3 o'clock (flying the arc clockwise) or 9 o'clock (flying it counter-clockwise), then adjusting that heading by 5 degrees to the "inside" (right for clockwise arc, left for counter-clockwise arc).