Where are you located? Timing of doing things is related much to where you are. I would suggest a good wiring for this tree. Looks to have a relatively decent shape for a small tree. I find it easiest to wire these when leafless, so maybe this summer defoliate, and wire. Just watch the wire carefully, as it will dig in. I would maybe wire a bit loosely as they tend to spring back, and that way you can leave it on a bit longer.