Do a background check first. If this is the same Mike Harnish who attacked someone in the park where I was a few years ago. The neighbors were scared of him too when we talked about it after. The police thought the guy was vandalizing or something, but we talked to him later and got the story. Police were afraid of him too because of his violent record, you can request a copy of criminal background for any contractor before hiring him. Just be careful before allowing anyone into your home who has anger issues.