He was lucky not just hard working
This film basically espouses the old 'if you work hard enough and believe in yourself, you can make your dreams come true' mantra.
But Chris, while working hard, also had a fair amount of luck on his side. He was lucky he was born very smart, he was lucky also that physiologically he was able to deal with enormous stress and little sleep without getting ill.
But there are so many people out there who aren't incredibly smart, through no fault of their own (just genetics), and who physically couldn't cope with the demands that kind of lifestyle put on them. I always see people saying 'anyone can make it if they try hard' etc etc, but it's just not true.