This is exactly what I would say. I usually leave the seedling for a day or so to see what the plant will do on it's own. If the helmet is still there I dampen it thoroughly and then, grasping the plant as close to the husk as possible with my left hand, I gently start to apply a steady pressure on the husk with my right. It can take several minutes, but as long as you are patient, as Potawie says and don't use any sudden or erratic motions, you can be successful. It helps to dampen the husk, though. Just my two cents on a topic that haunts all of us.
If I see the husk while the plant is still looped, I often place more damp soil on top of it to give it another day or two surrounded by soil, and that seems to help.
This may sound really stupid,but I'd love to see a video. I'm currently batting 0-4 in getting the helmets off. Maybe I don't have the same hands I had 10 years ago during my O.R. Rotations, but I cant seem to get these damn things off properly.