P. afra is a succulent, so you can't really wire them (they don't have an internal skeleton of hard wood). They are best grown via the "clip and grow" method... which means you simply use sharp scissors to guide their growth and development.
The only trick you need to know about growing cuttings is to make sure you let your cutting wound dry out before you plant the cutting, otherwise you run the risk that the cutting will rot. So cut off branches you don't want, stack them in a pile somewhere, wait a few weeks, and then pot them up. It is exactly the opposite of what you would do with most other cuttings.