UPDATE: taking the plunge. F-150 spark plug change

LittleBill wrote:
i'm confused on these comments of using a torque wrench to remove stuff, everything i have ever read including my torque wrench manuals state to only use them to tighten never for loosening?

The idea is they are trying to get the mechanic to "stop" before just going all macho on it. If it won't come loose with a given torque setting, the hope is, you will consider other alternatives before you go on and pull the threads right on out.
Sometimes just gotta do what 'ya gotta do though.