Kirk Powers changes a light bulb in an exterior lamp. The Homewood handyman has been fixing things big and small for more than a quarter century. He not only knows how to make things work but loves sharing his knowledge with others. (Photo by Carrie Steinweg/ H-F Chronicle) Some people are experts in one area. Others know a little bit about a lot of things. And then there are people who seem to know how to do it all, like Kirk Powers of . . .