Don't overstretch when buying a home or renovating an existing one. Even if it feels like a good idea in the moment, it often proves to be a costly mistake. "It is very important that people make smart financial decisions when they're buying or renovating a home," Drew Scott said on Yahoo Finance's Opening Bid (video above). "And some people will get so emotionally charged that they'll run in a direction, they'll do something that they're never going to recoup that money if they have to sell." "I alwa ...