I've been trying to figure out how to defuse a bomb for a book I'm writing, but most things aren't very helpful or are too dense in just detailing what kinds of bombs there are.. If movies and TV are of any help, you have to cut three wires in the correct sequence, the primer, the reactor, and the ignition timer?
I doubt it's as arbitrary as blue wire, red wire, green wire, because that would indicate all bomb-making fiends use the same brand of wire. Are there other ways to defuse bombs rather than just clipping wires? What would be a simple kind of timed bomb that any bad guy could make that could only be disarmed by an expert? (In this case, the protagonist has studied this in school.)