Make sure you cut at a 45 degree angle, and that you have cloning gel ready, also rubbing alcohol between cuttings for the razor you will use, and like the above said make sure you at least have 2-3 nodes, that would be the little leaves forming up on top of the bigger leaves, make sure u cut below 2-3 of them suckers, and make sure to get at least 2-3"s of stem and stick it in rockwool, or whatever you have available