CHICAGO - The staff at his neighborhood hardware store can spot John Carter from a distance. He's the slightly befuddled guy who often comes in declaring, "I have no idea what I'm doing. Can you at least get me through tonight?" The 26-year-old Chicagoan, who's been slowly rehabbing the condo he bought last year, is part of a generation of young homeowners who admit they often have no clue how to handle home projects. Story continues below « -------------------------------------------------------------------------------- advertisement -------------------------------------------------------------------------------- For them, shop class was optional. It also was more common for their parents to hire contractors, leaving fewer...