ProMaster Home Repair & Handyman of Cincinnati offers Christmas lights installation in the Cincinnati area (though not Northern KY). Unlike many services, ProMaster starts with a $79 consultation for any project (though of course those free design services get covered by the final project cost with the other guys.
ProMaster offers many other services than holiday lights installation, but their overall rating on Google is about average with a 4.3 rating
ProMaster
1375 OH-131 STE C-3
Milford, OH 45150
(513) 322-2914