Do you mean a fire resulting specifically from the work you did? That's very difficult to prove in many circumstances. And if you do the job to code, as every electrical job should always be done, there's nothing wrong with doing it yourself. And nothing to be said by any insurance company in places where you are allowed to do your own work.

Here in Ontario a homeowner can do their own basic wiring - which is the type required for many kitchen remodels. Electrical work is pretty easy and quite straight forward. Unfortunately, it's still something I wouldn't recommend just anyone do. Some people just don't have enough common sense to follow code, or worse, the basic skills to simply do an adequate job.

That said, some electricians, while wiring within code, can still make a right mess of a job. Just look at the wiring in the new construction around my development.