There is a big yard in the west end of Baie de Moselle (easy, longish walk to town services). The War Museum is in walking distance, and we found it informative.
Note, all the bays around Noumea are presently closed to swimming, for a year, due to a shark killing a swimmer.
Marina Moselle can put you in touch with folks who help with non French speakers, and would certainly be able to recommend an agent. You will also have to deal with
insurance, and arranging to export the
boat when it is ready to leave. It should be a pleasant trip back from
New Caledonia, too bad about the swimming ban. It is easy to arrange
laundry from Marina Moselle.
Ann