I have a full set of slides showing doing step leaf cuttings but I will try and briefly give details of my . Choose a medium size leaf from a plant watered the day before. I cut down the centre so as to have two half, I then cut in approx. 1in lengths these are put on edge, slightly buried in a mixture of perlite and peat based compost 50 % of each. Water well with a rose and just wait . I do not give them extra heat or polythene bags but plenty on sunlight. There form many new plants on each piece and it is worth separating them to get better plants. I am retiring from giving talks and have many slides done for giving talks if any one is interested.