Something you own breaks. You might have a leaky faucet or a clogged sink. Maybe that key isn't turning in the door as smoothly as it once did. If you're mechanically inclined, you fix the issue and go on your way. If you're like a lot of people, you start wondering what it might take to fix it and how much it might cost to get it working again.
You can hope it will eventually fix itself or you can grab a book and learn some Do-It-Yourself. These books can start you on the path to becoming a DIY star. Before long, your friends will be asking you for repair help.