Suggested (but not absolutely necessary):
Watch the example video above. In this scenario a dog is triggered by scooters. Note how quickly they dole out the treats and how the scooters keep their distance at first.
Work for 5 to 15 minutes at a time, once or twice a day.
The trigger should be able to gradually get closer to your dog without causing him to react.
My dog went nuts when the trigger came closer.