I'm still pretty new to this game, myself, but it seems to me you're best off leveling pretty much all DoH and DoL classes closely together. This is because you'll often need to get mats from one class to use with another. Leatherworking, for example, often needs bolts of cloth (made by Weaving) and alumen (obtained by Mining), while a Weaver will in turn often need leather, as well as fibers (obtained by Botany) and silver ingots (made with Goldsmithing, from ores obtained by Mining).