I wouldn't say hard, exactly. A bit time consuming, maybe. It's pretty easy to grasp the basics of your strongest craft, usually someone has those down in a week or two. It's - learning what to do to help something best or what not to do in order to prevent making anything worse, branching out to stuff that isn't your basic strengths, mixing them, inventing things that combine several crafts - the nine groups are kind of vague, actually, there are a few things that are arguably part of several.
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