Step One:
Have them start by turning the dial two full turns to the right.
So it passes zero twice.
Keep turning until you get to the first number in the combination,
12 in this case, and stop when it lines up with the triangle at
the top of the lock.
Step 2:
Have them turn the dial a full turn to the left.
They'll go past the first number in the combination.
Make sure he stops at the second number in the combination,
which in this case is 14.
Step 3:
Have him turn the dial to the right
until he gets to the last number in the combination.
Now, pull down the lock and it should open.
If it doesn't encourage them to take a deep breath,
go back to the beginning and try again!