I would wait for warmer weather to do the trimming, in the meantime, just put a stake to help the plant upright a bit. I have a dwarf schefflera, and I have learned growing this one that it can tolerate cold once fully established but when getting the cutting, best to wait for warm weather at least 65 to 70F , remove most of the lower leaves so it can divert its attention to making roots. I find that when weather is consistently warm already, it is easier to root directly in soil, or you can root it in water first. But in cold weather rooting in water runs the risk of rotting.
My dwarf schefflera is not such a dwarf now
but is still growing well.
The mommy plant in 2007:
The mommy plant: photo taken today 07Jan2013
And these ones were once cuttings from it:
(just waiting for warmer weather so I can trim off the unbalanced sideways growth)
(sorry lopsided photo)
