systeMacs can help you automate tasks using the Automator application. This can include
renaming a large group of files or photos. We can show you how to make the most of this
valuable application.

Accomplish all of your time-consuming, repetitive manual tasks quickly, efficiently and effortlessly with Automator Workflows. It’s simple to create custom Workflows just by dragging items, pointing and clicking. Perform the task once using your Automator Workflow or many times — even share Workflows with friend

The possibilities even extend to other non-Apple applications. You can watch a demo of Automator in action here.