People watch you very closely in Hollywood and especially on the set. Two rules I’ve always learned that you are never to break, ever. Never be late on the set and always listen to the director. Follow those two rules and you’ll go far in this business. Professionalism is key to longevity. You don’t want to end up in the tabloids even before you become famous, do you?
Be professional in everything you do. If you carry yourself like a star, people will treat you like one. No one wants to work with a snob or an arrogant diva. Those kind of folks always come and go. However, real stars, professional stars, last forever.