It all boils down to how much you trust the person's competency, and how effective and specific you were in your directions. As long as you're using someone who has any skill in the are in which they're working and you've clearly laid out deadlines, expectations, and quality control you're on a good path to recieving a finished product you're going to be happier with and spend less (if any) time error-correcting. Just my two cents
