You can take softwood cuttings in summer or hardwood cuttings in autumn. Cut pieces about 4" long from the tips of branches. Trim them to just below a leaf node. Remove all except the top 2 leaves then dip in rooting hormone powder or gel and put in trays or pots of ericaceous compost mixed with vermiculite for extra drainage.
Water with rain or distilled water - unless your tap water is soft - then keep them sheltered from direct sun, wind and frosts. They should root by next spring and then you can pot them up into individual pots and grow them on.