Whenever the opportunity presents itself, the way I prefer is ground layering. Bend a branch to the ground and lay a brick or rock on it, or secure it to the ground with a U-shaped wire. You want to ensure that a healthy node has contact, and that a significant growth tip is sticking out beyond the grounded point. Some people bury the contact node a bit, I usually don't.
Then the only thing you need to do is wait and not disturb it. No worrying about seasons, humidity, anything really. When you see that it is growing and resists a moderate tug, it's ready to cut from the mama and shovel up the new root ball. Whenever you're ready too, and it's a good weather day for it, it should go from attached to mama to installed in a new location in about 15 minutes.
If a branch won't reach the ground w/o breaking, a pot sitting next to the mama with soil to the rim can sometimes "raise the ground" to a workable level. Spring is a great time to get started, you'll likely have something to transplant this year. [/i]