Autumn to winter is the best time to take hardwood cuttings form shrubs.
You can do them outdoors in a sheltered spot by simply making a slit trench with your spade, dropping some fin grit down the bottom and then inserting pencil sized cuttings at regular intervals and pushing the soil back.
However, I find ceanothus and variegated euonymous can suffer in cold winters so you may want to do them in deep pots of free draining compost and keep them in a cold frame or greenhouse over winter.
I had cream nasturtiums jo. 'Milkmaid' was the variety. I got them online from Thompson and Morgan - I think
Just gritty compost smallswan. Mix some grit or course sand into the compost you have
I'd agree totally with obelixx about the ceanothus and variegated shrubs. Wet cold is a killer for them.