I have a 90% survival rate and this is what i do.
It is critical AND THE MOST IMPORTANT THING TO DO, is that you sterilize everything before you start because cuttings are very susceptible to fungus, viruses and diseases until they root. Use rubbing alcohol on your hands, the razor blade(use brand new ones!!!) and the cutting block. Rinse the shot glass (or whatever you are using) with alcohol, dry it and then fill it 3/4 full with rooting hormone(clonex gel). i use rappid rooters and i think they are one of the best and most easy to clone into.
work fast but safely.
When taking a cutting you must cut it long enough to have at least one
trimmed internode under the medium. Try to take a cutting that is at least 3 inches long.
cut the branch at a 45* angle about a half inch below the node I plan on
being below the surface of the medium (more than one node can be under
the medium surface). then stick in the gel. i let them stay in there when im doing the next step.
Once the cut has been made, and its in the gel, trim off all leaves and branches except the top two fan leaves(if they are on the bigger side i cut the fan leaves tips off about 1/2 way and the growing tip of the branch. This will leave a nice stem for planting.
After the gel put them in the rapid rooters and in the tray.
put on a dome and mist them with clonex liquid also put some water in the tray and a week or two and as long as you mist and fill the trays with clonex liquid youll have babies!