I'd put that leaf on/in mildly damp planting medium and sort of try to prop it up at a slight angle. If you bury the rooted end, do it no more than about 1/16" max. It will anchor itself as the roots establish and grow. Put it in a warm location with lots of light (maybe not direct light, just yet, but very bright indirect) and wait. You won't need to water for a while, it will live off the succulent leaf for a while. You'll see a little plant rosette form and make a new plant at some point. Patience is always the key. If you do decide it really needs water, water it from the bottom. When I do that sort of thing in the winter months, the plant material tends to be just resting on the top of the medium and I don't water at all.
Its winter in the continental U.S. Light is lower, temps are cooler. Even in the warmer areas. Not a huge consideration, I guess, if you are located in the southern half of Florida, the valley in Texas or in south California and maybe along the Gulf coast and border areas between Mexico and the U.S., but even those are milder with lower light than in the summer, so for the larger plant, mostly just let it rest in the winter months. My experience with plants of that type is they try to grow too much in the winter and etoliate in the lower light. The more inside light the better on the larger plant. Too much water will be the biggest pitfall.
