I have heard it reccomended you take Gnomish Engineering, make all the trinkets, then switch to Goblin Engineering for the other trinkets and explosives. Has anyone tried this, and if so how successful is it?
Also, from looking at the trade skills on this site, it seems the vast majority of items are learned from patterns, not from a Gnomish or Goblin trainer. In fact, it appeared to me the trainers only give you 3 or 4 items. Is this true, or am I misreading?
And as a note to others who have questions, there is apparently a book in a house north of Steamwheedle Port in Tanaris that allows you to change between Gnomish and Goblin. I haven't done this myself, obviously.