Best way to level Accessory Crafting?

The big cost, afaik, is the fatigue pots. Even with the reduction in fatigue for crafting (5 per item worth 200 mastery) you'll need about 800 fatigue to get to level 10, which is 200 base + 600 from pots (2mil)

Anyway, the amount of silver plates necessary to get accessory crafting to 10 is a bit over 600k.