DMM = digital multi-meter. (Voltmeter/ammeter/ohm-meter)

I guess it's not too hard to swap that ignition switch, but if you've never done any wiring of any sort, it's hard to say whether you'll find it easy.

If you want to start doing stuff yourself, get a shop manual for your car. Helm is the best (www.helminc.com). Lots of stores sell Chilton or Haynes books, which are sorta OK. Public library might even have something. Even if you go to a mechanic, looking at a repair book can enable you to talk intelligently to the shop. Sometimes that makes a difference in how the shop treats you...