Yes! Don't be discouraged if it all seems a bit bleak when you start out! I'm still finding it slow going but I'm definitely in a better position than I was when I started, if nothing else because I have an awareness of my finances now that I didn't really have.
Basically, you work out a series of categories (YNAB suggests some but you can change them, add more, move them around etc) and when you get money into your account you assign money to those categories. But only when you have money, you don't assign money that you're going to get in the future.
So imagine this month I have to pay:
Mortage 500
House Insurance 120
Car insurance 160
Petrol 250
Food 600
(obviously there will be loads more than this)
And I have 1700 in my account cos I've just been paid.
So I assign that money across each category. It's like envelope budgeting. I can't assign any more money to anything until I receive it. So I can't assign more money until i get paid again.
As part of the categories, you work out your long term expenses. So, things you know will come up, but not every month. Maybe it's only twice a year. I have to pay rates of 220 twice a year, so I split each payment into 6 and put money in that category each month, so when the time comes I have the money ready and don't end up scrambling about and putting it ona credit card or whatever.
It takes a while to work out all your long term expenses, and for me they are the key to getting control of my finances.