It has been quite a long time since I last grew Angelwings. My recollection is that there are a number of factors that may affect flowering. Those include keeping it potbound, lots of sunlight, regular fertilizing with high phosphorous fertilizer and shorter days and drier soil in the fall. That said, I would not make a fetish out of any of these because it will probably flower whenever it is ready.
Allegedly, it tends to bloom in late winter or early spring, but I'm not sure that is true for potted hybrids.
I'm not sure if pruning will discourage blooms this year. Certainly, it will if you have reason to believe it is on the verge of flowering.
Cuttings will root at any time of year.
How much you prune is really an aesthetic question that depends on how you want it to look.
One option is to just prune back some of the tallest stems and leave the others alone. More substantial pruning can be done in the spring or any other time.
