Take it to a shop and have them do it. It's not too hard to do but its not fun to do. Re-packing hubs is the most anxiety provoking activity when working on bikes. If the cones are too tight yer screwed, if they are too loose your screwed. If they are just right you'll never really know. They never made a torque wrench for cones.

I recommend you adjust them tight enough that there is the slightest bit of play in the axle. The final adjustment can not be made until you put the wheel in the frame. Remember that when you clamp the quick release you are actually placing a load on the bearing. I like the fat thick phil grease in my loose ball hubs.