See if the contractor has complaints or compliments on his file. So now you've chosen. Last few things to do. Make sure the contractor has the necessary bonds, licenses and insurance, all in force when your job starts. Designate a contact person the contractor can call at noon when one of his men accidentally drilled through the wall into your priceless Picasso.
Accidents do happen.
Make sure you have a number for the contractor that won't simply be an answering machine. If you need to be able to reach her, you are going to want to be able to reach her. Even in the middle of the night. The workers should not be your concern. If there's a problem, the contractor should handle it.