Processing is the beginning of crafting for any player in the game. All it requires are item drops off monsters and checking to see which items can be processed. It's probably the most simplistic of all crafting skills, as you can just go through each item and try produce all to create the items needed for the other crafting skills.
Processings Skill Groups
Cast Iron Recipe
This Recipe group has 3 tiers of crafting :
Uses Hilts, Pikestaves, Sheaths, etc. of Levels 1-3 quality
Uses Hilts, Pikestaves, Sheaths, 'etc.' of Levels of 4-6 quality
Uses Hilts, Pikestaves, Sheaths, etc. of Levels of 7-12 quality