Taking your fitness to that level requires much more dedication than the average weight loss goal, but it's a great goal to set. Beside being able to do fitness routines, the last 6-8 weeks take 24/7 dedication to lose the majority of your body fat etc and get in to prime shape for the competition. No illegal drugs are required if that is what you mean, but some of the girls do use them as a finishing touch the final days before a contest. First time local shows wouldn't require anything like that, it's only at the professional level where it may come in to use.
There is also an emergence of figure as well as bikini classes, neither of which require routines. The bikini is more attainable as the girls are a bit softer than the figure competitors.