Be careful to check references as with any employee who will have access to you or your home.

We recently had an "approved professional" electrician sent in by our landlord to add extra ground fault outlets and he stole several items from the house. We complained about the criminals (he denied it but his assistant admitted it) and they were fired. Thieves think it is unfair to be fired from their jobs for the behavior of stealing. He actually expects unemployment benefits for being fired for stealing on the job... really? yes really! *gasps with disbelief*

So be extra careful around anyone new is my advice.