Years ago, I interviewed jeweler Alain Boucheron in his mansion overlooking Lake Geneva, the renovation of which he was overseeing. "I'm sure there are some mistakes," he told me. "But it's our taste. And if there are mistakes, they're our mistakes." I've had no formal training in design or carpentry—and some may say it shows—but that hasn't stopped me from diving headfirst into home improvement projects. Like many DIYers, I get satisfaction from handcrafting a living space that, for better or worse, is uniquely mine.