The DD is even easier after you get used to it. Think of the center of the coil as a narrow blade. I pinpoint by scanning side to side, making a mental note of the strongest signal. Next, I move 90 degrees and sweep again. where the two strongest signals meet is where to dig. A lot of the guys on here find the strongest signal in one direction, and then slowly pull the coil back until the signal tapers off, and the target is then directly in front of the coil. I have tried this, but I'm not as accurate with it as I am with the X method. When I was learning the coil, I put a coin in a phone book and went outside to practice finding the coin's location. It is a quick learning curve, and you'll have it down in no time flat.
Good luck and happy hunting!
Darren