moving a young tree

You can do now but you have too do a clod proportional with the Acer for be sure do it big and envelop the clod in a large material,fix it sturdy but of course the new place will be ready first and let the material search some pictures on the net <<clod tree>> if you don't understand my poor English

I would advise moving it in the late autumn NEXT year.
Early next year (say in Februaruy), go round it with a spade and sever all the roots leaving a rootball you can manage when you come to move it. Let it grow for another season, keeping it well watered to make up for the root damage. As soon as the leaves have dropped, you can move it and prune any top growth at the same time. Whatever you do, DON'T PRUNE AN ACER WHILE IT IS IN ACTIVE GROWTH - it will bleed badly and may kill the tree