[Ysharros]

Yes, you can change crafting profs by visiting one of the other trainers - so if you're an outfitter but want to be an artificer, go see the Artificer trainer in your local crafting area. Note that you need to have finished the intro to crafting quest before you can do this (so if you're in the middle of it, you need to finish it first).

And yes, you'd need to start another char unless you were willing to give up whatever progress you'd made in your main's old crafting prof.