I'm sure that the plants have gone into dormancy. The procedure to follow will be the same as I described in 'Transplanting specimen plants and shrubs' but on a much smaller scale. The root ball will be much smaller, but the roots themselves will be more delicate and fragile. Maples saplings transplant very easily, so this should be an easy and safe gardening task. Be sure to place a stake next to the plant and attach it loosely to support it against the winter winds, and apply a good mulch of leaves over the roots.
Next spring begin feeding as soon as the new growth begins to appear.