Previous experience is not essential, but it certainly helps. The important thing is to prepare yourself physically, as the fitter you are the more enjoyable the experience will be. And the better chance you will have of reaching the summit. Train gradually, starting a few months before your climb: strap on your hiking boots, put on your daypack with around 6kg (13lbs) of weight inside, and do some longish hikes. If you can build some ascent and descent into your training and hike on consecutive days, all the better.