You're not a robot. It's OK to make mistakes sometimes on DJ stage. However you should try to avoid all the mistakes what you can. Here are some of my advice for that.
1. Know Your Equipment
As a DJ you have to know the equipment what you play from. There's nothing more disturbing than when you stand in the DJ booth and you're looking for some function or some button and you don't know where to find them. If you don't have the DJ equipment just go to the closest store right next to you speak with the owner speak with the seller most of the times they're ok with it to
let you practice on the DJ equipment. If the first one...