To be successful in any endeavour, one needs to ask two questions:
- Am I able to do what needs to be done to succeed?
- Am I willing to do what needs to be done to succeed?
Like it or not, humans are governed by morals, and thus we are divided along moral lines. There are two types of people who will succeed: those who are willing to cross that line, and those who are brave enough to call the exception and dive into the moral greyzone when the need calls for it.
If the task calls for it, and you aren't willing to do either, I'd suggest that you quit. Because willingness always has a price.