You have to not listen to the nay sayers because there will be many and often they'll be much more qualified than you and cause you to sort of doubt yourself.
Many people you think are individual achievers in fact have either a strong spousal partner over many years or a business partner who's either in the background, not given enough publicity or less egocentric.
Sometimes I read a script and it's obvious from early on that it's one where the suspension of disbelief has to develop strongly from page one. Some are more reality-based.

