The few times I've done WILD they were never actually intentional. What happened was that I'd be laying down and suddenly become aware of myself. Like I would wake up during the transition from waking to dream and I would feel the vibrations. They went from my feet to my head and afterwards it was just a simple matter of getting out of bed and starting my dream. This is the part that people overlook when it comes to WILD. You have to fall asleep. If you're concentrating too hard and looking for images and stuff chances are you're never going to fall asleep.