How do I "unlearn" skills?Follow

Alright, so I was looking on the site and since I didn't see anything relating to Mining trainers, I found the blacksmithing trainer because I figured it was sort of a combined thing. I later found out that that wasn't what I was supposed to do and now my goal of learning mining and engineering is botched. Can somebody tell me how to unlearn blacksmithing so I can get my engineering groove on?

Yes, god forbid I shouldn't know everything the second I start playing the game.