When shall be the best time to transplant a Contorted Willow?

Hi all,I have a contorted willow in my back garden,it was only a mere twig once but last year it has gone wild,it is now some 8ft tall,trouble is it is in my back garden which is very small and I wish to transplant it down the paddock.

Some leaves have already dropped but do I wait until it is bare before taking on the major task of re-locating it?!

Any advice appreciated

Just in case,  it may be a good idea to take a few cuttings, and stick them in a dampish piece of ground.  If tree isn't happy about the move, at least you'll have those.