Programming is a lot like building cars ... You've living in the years before WW2, you're a farmer, and you've built yourself a nice jalopy, it gets you where you need to go, you can fix it when it breaks, all you need is a hammer and some nails. You loan it to your friends and neighbours, and no one has a better car in town. Now you've moved to the city, not just any city, the biggest city in the world, the city of the future, the giant-super-hyper-megalopolis , CPAN, where everyone's got hybrid-powered flying/swimming/dancing cars that chit-chat while they massage your behind, all while making you coffee, cooling you off, and avoiding pot holes and reckless drivers. Your jalopy doesn't even have a roof, seatbelts or shock absorbers, you've never even heard of fuel injection and you only get 3 miles to the gallon. You're scared and confused, don't understand why all the CPAN cars have all these things. You're not gonna learn all the whys and hows by looking at the cars, you gotta go to school boy and hit the books :)

Putting cars together is a lot harder than just driving them, and if you're building a car for Joe the milkman, don't try to turn him into a mechanic, give him a single file he can just double-click and follow directions, nothing else to copy, nothing else to install.
:)