How easy are ficuses to grow
I only have one variety and have only been growing them for about three years, but for me they seem rather easy. I keep them outside all summer and under fluorescents during the winter. I don't get nearly as much growth inside as I do outside. They grow much stronger outside in full sun.
For this reason I think I would wait until the beginning of next summer to do any serious chop. If you are just talking about pruning, leaving a fair amount of foliage, then you can do it now. If you intend to chop down past all the foliage I would wait. I also prefer to re-pot during warm weather as well but Ficus are rather forgiving.
The cuttings will stand a better chance of rooting during warm weather as well. You can find rooting hormone (for the cuttings, right?) locally, there is no need to resort to mail order.
There is no need to rush into anything, this is the way I have made some serious blunders in the past. Slow down, you will have these trees for many years if you don't kill them. I'm not saying that you can't work on your new trees over the winter just to carefully consider what you are about to do.