I would wait until late February or early March to bare root and repot. Last year both of my Poms kept there leaves until January. This winter we had an early cold spell, the Poms are showing a beautiful golden yellow and now are dropping leaves. At this time of year I would focus on structural branch selection and if possible secondary and tertiary branches. Careful however when removing large branches if there is no foliage above or around the removal sites, as Poms tend to dieback along the trunk. I learned this the hard way on a clump shohin I was working on. A few pics of my Poms for you.
