You may mess up now and again but, hey, everyone makes mistakes. At least you will be gaining experience and learning, even if it is to a pub full of drunks on a Friday night. The point being, every little bit of experience is good experience, the more confidence you can build, the less likely you are to make mistakes.
Remember my comments in the first paragraph? flexibility is a must This isn’t a reference to your aerobic skills. I am of course talking about your musical abilities. Sticking to one type of genre is all very well for the Tiestos of this world but in the early days of your DJ career you may not be able to pick and choose. Play whatever you think will pay the bills until you become established; everybody has to earn a living.
Learn to use different equipment.