Re: When to hire a pro...
electricity is really simple when you take your time to understand it
get yourself a multimeter and work from the battery to the electrical panel, then from the panel to each circuit, as long as there is no break in the wires and no blown fuses, the current will flow.
if you need help, I'm sure many people will chime in to help
start with a pencil and a piece of paper and draw what circuit you can find