How to solve a 4x4 sliding block puzzle

Ever feel like you cannot change or learn something new? It happens to most of us. I like conquering little puzzles like this, because it reminds us we can improve ourselves. It does matter that it is in some silly, trivial way: if we can learn this, we can learn anything.
Here is how to solve the 4x4 sliding block puzzle. It's a fun thing to do with a serious message.