But, if you lose your key, don't have the code or whatever, there is a workaround.
A couple years ago I took apart my ignition switch for cleaning, etc. Later it turned out to be okay and I didn't screw anything up, so I got experience, no more or less.
But here's the deal: the ignition switch only closes two pairs of wires. A quick look at the wiring diagram which everyone should have, tells you which two. This means several things. One, you can replace the ignition switch with a pair of toggle switches, or a three position switch (off, lights, run). Two, in a real pinch you can jumper the correct pins and go. Three, it also implies that the meanies can pretty easily hotwire your pride and joy and ride off, but they'd have to know which, and none of us would do such a thing.