Step 2: Take her apart
Of course all phones are different, but generally speaking they are dead simple to take apart.
Use a flat head screwdriver to remove the phone housing from the base. Detach all of the wires from the ceramic block, then pull the coiled cord free. If it is a newer model old phone, you will only have to unplug the handset. You won't be using this, so put it somewhere else.
Carry on removing all of the bits and pieces - bells, transformer and so on. Or just leave the stuff in there, too - there's plenty of room.
Next, unscrew the covers for the microphone and earpiece. The microphone just slips out. There are two wires and a plastic housing at the earpiece, and again remove all of the wires so that you just have the empty handset.