PirateJim

This is a complete noob question, but I have to ask... I've been out of the DJ scene for about 4 years now and I'm djing at a bar in a few weeks. I'll using CDJ's with CD's (no laptop). So... ff I rock up to this bar and the guy/girl before me has been using a laptop, do I need to change any of the leads or inputs/outputs to switch everthing back to the CDJ's? Or can I just put a CD in and go for it?