Let's not mince words: You'll either need to "forget" your "good" credit card in the car, or bring a friend who is good at restraining you before you feast your eyes (and feet) on Nordstrom's shoe selection. By all means buy, but when the mortgage is at risk because, GOOD GOD, there are so many pretty pretties in that devil's den of bipedal luxury, you may need some financial-planning strategies. You've been warned.
