With D. capensis, leaf cuttings are easiest if you use the water method. Simply clip a leaf off the plant, place in a clear glass or jar and fill with pure water. Place the jar with the cuttings under a light source and in a couple weeks you will have sprouts. If the water evaporates just top it off. If it becomes grungy with algae then pour through a strainer and replace the cuttings in fresh water.
Root cuttings: simply snip off a section of root, and bury 1/2" deep in media of your choice. Sprouts will be visible anywhere from 2 weeks to 3 months.. Dont give up on pots of root cuttings.
One final thing. Put that plant in the window man!!! Sunlight is better than ANY bulb out there and D. capensis LOVES full sun.. you cannot kill it with too much sun. Your plant will grow faster, dewier and bigger in the window than it ever will in the basement.
Good luck
Steve