Actually its not difficult to understand its just too complicated to learn. All they need to know is the basic, that is how to store their coins, how to keep it secured and how the transactions are made using a wallet. Those are just quite simple things which isn't hard to understand. There is no impossible if you are really decided that you want to learn, you want to earn and also just because you want. Bitcoin is not difficult to understand but the difficulty come from the usual things that we used to know and practice so it has become as a new thing new payment so it takes time to adapt and just by some tutorials and reading a little you can solve it and start to practice.