New guy from gen4 needs Gen3 help

I was asked to help out a local shop in the area get the idle and startup tweaked for a 2003 with a LS3 motor. I'm assuming they running a cable operated throttle body since they're still running the 2003 ecm... I tune Gen4's regularly but I know Gen3's are somewhat different. What do I need to know to get started, I'm assuming I need to download a different Scanner cfg and Editor interface. What else of primary importance do I need to do to get started? Should it be easy enough to work through the tuning aspects once I get set up? Any help would be greatly appreciated... :D