Yes, I transitioned successfully in 2002. It took about 6 months because the only method at the time was the Pose Method. I would do the drills, start running, and then run for 20 seconds using the Pose and then rest until I recovered. I gradually increased the time in the Pose Method from 20 seconds to one minute. Then, to doing runs almost completely in the Pose. After 6 months, I had mastered the Pose, but I was slower than before. I analyzed the Pose and realized that it was wrong. I added a pushoff and was immediately a lot faster. It took another three months to incorporate the pushoff off into my new forefoot form.
When I teach runners now how to transition to forefoot, I tell them to forget the Pose. It's biomechanically wrong. Instead, read Chi Running by Danny Dreyer or Natural Running by Danny Abshire. Both books have good drills and don't mess up the biomechanics as badly as the Pose Method does. Oh, and disregard the New-Age Chi BS that Dreyer goes on about... you're training to become a runner, not a Zen monk. Just skip that part.
If you're reading-intolerant, do this. Go to a track. Run barefoot on the infield grass for a quarter mile or so until you get the feel of forefoot striking. It's almost impossible to heel strike barefoot. Then, immediately put on your shoes and run like you did when you were running barefoot. Getting a shoe with a low heel lift will make the transition easier. Transitioning isn't going to happen in a day, week, or month. Even with the better techniques, it's going to take 3-6 months to fully transition.