To do learn grind(and survive)I would strongly advise against using a rail, even in full pads. First approach your FLAT grinding surface and place your outside foot in acid position and your inside trailing foot in training-wheel position(front wheel on grinding surface). You want to place your weight on the front acid foot, and crouch for some style. Also make sure you have enough room to complete the trick and come out of it, falling off the end is NOT pleasant, trust me.
