Sara B. is losing her cool.<P>Not just in the momentary-meltdown kind of way&mdash;though there's that, too. At the helm of must-read <I>Snap </i>magazine, veteran style guru Sara B. has had the job&mdash;and joy&mdash;for the past fifteen years of eviscerating the city's fashion victims in her legendary DOs and DON'Ts photo spread.<P>But now on the unhip edge of forty, with ambitious hipster kids reinventing the style world, Sara's being spit out like an old Polaroid picture: blurry, undeveloped and obsolete.<P>Fueled by alcohol, nicotine and self-loathing, Sara launches into a cringeworthy but often comic series of blowups&mdash;personal, professional and private&mdash;that culminate in an epiphany. That she, the arbiter of taste, has made her living by cutting people down&hellip;and somehow she's got to make amends.