Book excerpt: Remember when Sex and the City’s Carrie Bradshaw faced the brutal realization that she couldn’t buy her apartment because she’d already spent her money on a closet full of Manolos? Well, if Carrie had met Catey first, she’d own her co-op and be on her way to a comfortable retirement! Catey Hill is the online money expert for the Daily News Web site--and author of this humorous, practical "girlfriends guide” to personal finance for 20- and 30-something females. (The ones with the designer shoes...and maxed-out credit cards.) With a hip, "I’ve been there” voice along with worksheets and exercises, she helps women evaluate why they spend, get out of debt, and create a savings and retirement plan that even allows for the occasional splurge. Among the topics she covers: student loans, car payments, investing, saving for a home, and more.