Originally Posted by Mercury
Trainers can only be used if a skill is low enough (below level 3 I believe). Anything above that and you just get a message telling you your skill is too high. Also, each trainer can only be used once.
there seems to be 4 trainers for each skill. 2 for training when your between level 0 - 3 of the skill, 1 for when your between the levels of 4-6, and a final one for when your between 7 - 9