Can I ask when you prefer doing it and why?
Thanks

I can't agree with this statement Matt. I live in an area where winters are about as severe as they get in Aust. Down to -7C occasionally and below 0C most nights in winter. I do my repotting all through winter. Staring when the leaves fall and continuing right through to buds opening. I have not noticed any adverse reaction to trees being repotted early in a cold winter.The timing is more critical in places with colder temperatures so if frosts are a regular feature where you live then leave it as long as you can.