Computers make it easier to do a lot of things, but most of the things they make it easier to do don't need to be done.
Don't rule out working with your hands. It does not preclude using your head.
If you smile when no one else is around, you really mean it.
The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.