Use a pencil-thick internodal cutting taken from just below a node with a SHARP cutting tool. If your tool isn't sharp, it reduces your chance for success markedly. You can take the cutting long, and then clean it up with a straight-edge razor blade, but sharp is important.
Insert the cutting into a VERY well drained medium. I use bonsai soil that has all fines screened out.
Make your own greenhouse. This one has very dwarf hemlock cuttings cooking in it now. After the cuttings strike, remove the cap & wait a few days, then uncover the cutting entirely. Limit the number of leaves on the cutting to 3 or 4, or cut leaves in half across the veins. Yogurt cups work very well, too. Full, but open shade is best. Rooting hormone unnecessary.