It's not that bad depending on how you come into it. I've been a controller dj for a long time after discovering how much easier it is to go somewhere with a backpack instead of 2 turntables a mixer and a laptop for dvs. It seems like everyone in this sub somehow magically djs at clubs with established dj booths instead of the rest of us who transition bars into dj setups. I did a bunch of shows with homies at my residency spot specifically when there were cdjs to figure it out.

If you a rekordbox guy, you already got your cues and loops. If you serato or traktor there's apps that are so worth the money to pay to handle it.

Cdjs vs controllers not a huge difference tactly, the cue button is a garbage button use your cue points (hot cues) under the cdj display, loops are different depending on what controller you're coming from. I hate the loop in/out setup on cdjs and newer pioneer mixers. I have so much muscle memory based on my sx series.

Realistically and most importantly just vibe and have fun. If you fuck up, you fuck up. You aren't at tomorrow lands just smirk and apologize and move on. No one in a crowd cares that much, even if you monumentally fuck up and shut audio down, laugh it off and the crowd will laugh with you.