It gets a little more complicated than that. As mentioned before, you'll need to gear up your DoH as well. In addition, you'll want to make use of cross-class skills so you can high-quality gear. Otherwise you might as well just buy the gear off an NPC! You may also wish to look into food so long as you're gearing yourself up. In the end, if you're going to level any DoH, you should level all of them.