Back in the 80's the easy way to root cuttings was to use a product called Root Gelwhich I believe was supplied by ICI. It was so simple you purchased one of the pots of a special gel, about the size of a yogurt pot and just pushed your prepared cuttings through the lid into the gel.
Placed on the kitchen window sill you could watch the magic of your cuttings rooting while you washed up. Using the gel, cuttings rooted very quickly and then could be potted up into a normal potting compost.
For some reason Root Geldisappeared from the market but now has returned in the form of gel2root and should be available soon from most garden centres.