one of these days i think i am going to start charging for teaching and materials consulting.....  i had assumed it was some poor teacher asking, don't you have Longman and every other editora giving you sample copies and free lunches?  

I am from Canada and a heavy duty/diesel mechanic by trade. If have some mechanical knowledge you should do fine. Mechanical jargon is relatively similar between the related trades. If you are mechanically inept, good luck. You'll be able to teach them English, but not many technical terms related to their trade.