Generally the consensus seems to be for a Research-using class (NEC/ENC/WIZ/MAG), put a single point into whatever basic skills you need (many of them will level up without the single point, but this first level takes a lot longer) and save the rest of it for leveing up Research since it's very time-consuming and expensive to level up by itself. Other classes can get by putting training points into tradeskills and whatnot. Generally, combat and spell skills tend to be easily grindable in and of themselves, without the help of a trainer (as long as you've got one point in them to learn them initially for post-level-1 ones). I myself don't have experience with Research, though, and what I'm stating here is secondhand, so take this with a grain of salt.
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