Pruning, if you have to, can be done when the leaves have dropped off, until about early Feb. You can trim small stems off during late summer. Repotting is done in mid spring, when the tree is coming into leaf. It then makes good root growth and takes up excess moisture. Repotting in autumn into winter can be damaging because the growth has slowed, roots aren't taking up much moisture and the plant sits in the extra soil around it which often gets soggy in the winter wet. That excess wet will rot the finer roots and when new growth demands nutrients and water from the roots in spring there are no roots to perform that task. The tree suffers as a consequence, new shoots die back and the tree can go into complete decline.
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Pruning, if you have to, can be done when the leaves have dropped off, until about early Feb. You can trim small stems off during late summer. Repotting is done in mid spring, when the tree is coming into leaf. It then makes good root growth and takes up excess moisture. Repotting in autumn into winter can be damaging because the growth has slowed, roots aren't taking up much moisture and the plant sits in the extra soil around it which often gets soggy in the winter wet. That excess wet will rot the finer roots and when new growth demands nutrients and water from the roots in spring there are no roots to perform that task. The tree suffers as a consequence, new shoots die back and the tree can go into complete decline.
H-C