Well, I run a small, and until now, one person electronics company. I do most everything from mechanical work to plumbing to setting up security and computer systems.
I shop out a lot of work to contractors, usually, but things are going well, and I was thinking of taking on a few people. You'd need to be willing to learn on the job some of the stuff you don't know, but you'd never be left hanging in the wind, and you'd always have resources at your disposal.