Acting is one of the toughest professions in the world and only a handful of lucky, talented individuals ever make it to the top in the business. Luckily, many people succeed in getting on the acting ladder, and sometimes become A-listers later in their careers after gaining stardom from a successful series – Chris Pratt is a prime example of someone who has done this recently. Here we take a look at some of the factors that lead to success and also examine the careers of people who have made it.