Take some time and look at your tree. Thin out or remove bar branches, branches on the inside of curves, Branches that are too thick towards the top of the trees, etc. Stand a piece of wire at the site of your new front, and begin restyling. Wire the tree starting at the lower parts and working towards the apex. Carry the wire out to the very tips of each twig.
Deciduous trees are a bit of a different story.
The branches get stiffer in the dormancy, and will snap much more easily. Also, if you stretch the cambium and put little tiny hairline cracks in it, the branch may die, especially if you then allow it to freeze. Thus, this is a relatively lousy time to style and wire these trees. However, it s a great time to make major cuts. The reason you can do this on the day of repotting is that cutting the roots simultaneously prevents the bleeding.