If you're like most people, you probably know it's hard to save money. Really hard. But do you know why?

Sure, we all know that one person who is really good at managing money and seems to have this whole saving thing figured out. But for the rest of us, storing all those "acorns" away for the winter is just tough. We all know it's important, but where — and how — do we even start?

First, know that you're not alone: Research shows that a lot of Americans don't have much in savings. One survey of about 5,700 people released by the Federal Reserve found that 46% of adults could not cover an emergency expense of $400 without selling something or borrowing money.