You can get a rooting hormone at a gardening center. You just cut off the branch and use a knife to shave off all of the bark at the cut so that all around it is bare. Dip it in the rooting solution and place in soil. Keep it moist at all times. I have better luck with a small branch then a large one.
If the branch is small enough that you can put a glass jar over it, you won't have to worry about watering even. It will work just like a terrarium.
I have not been able to find the rooting solution at Walmart etc. You need to go to a more specialized gardening center.