Yeah, it's not rocket science. The biggest money losers are too much house and too much car and all the interest payments that go towards it. Even by eliminating the interest by paying in cash you're already cut your expenses on those items by 50%. The rest is just details, but most importantly. Don't buy ANYTHING on credit.
Okay, to be more precise: >>Don't pay any interest or fees<<. I do run online purchases through my credit card and then pay off the balance in full every month.