The ADF is a wonderful bit of kit for spacial awareness. I find the simplest way to get it across to people is simply to mentally overlay the RBI needle onto the DI (if you haven't got an RMI) and read-off your track to/from the beacon (use the tail for FROM, use the head for TO). Compare this to the number you want, if you're going away: turn Right for bigger numbers, if you're going Towards: turn R for smaller numbers. The advantage of this is that it's a really simple rule that you can use when you've just turned in-bound in the hold and don't have long to think. HTH
HFD