Just for a quick addendum to the "level everything to 15" thing, except with a little more detail:
For leveling, I think a bare minimum of Tricks of the Trade (Alchemist) and Hasty Touch (Culinarian) is pretty much necessary to get somewhat consistent HQs for leves. Careful Synthesis (Weaver) also helps a bunch, but I think you can survive with those first two fairly handily with some luck/experience. So before you hunker down, you should get those two first, and Weaver as well if you feel like you can stomach one more.
The two durability skills at level 15 - Manipulation (Goldsmith) and Waste Not (Leatherworker) - also have their uses, but imho aren't as absolutely necessary as you level or even once you hit 50. It's nice to have the option eventually, but that's it. For level 50 crafting, you will need to eventually get Ingenuity as well (Blacksmith), but again, I think you'd be avoiding situations where you'd have to use it for leveling so you can leave it alone for a while.
Beyond the level 15 skills, any proper crafter will have Carpenter and Weaver 50, as well as Culinarian at 37 for Steady Hand II. So if the crafting game is your interest one of those (I'd suggest Culinarian 37) should be your immediate targets after getting the necessary 15 skills to actually level.
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