Karma Yoga in Modern Life!

As I have learned that one should focus on Karma (action) without considering the results, well I agree with this, but my question is that if you are self-employed professional then how you can focus on Karma without getting bothered about the consequences? Like there are so many worries , infrastructure set-up, staff salaries, electricity expenses, etc. , all these things keep on coming to the mind while executing any project so how to cope with this practically?