take care of numero uno

To put one's own needs, concerns, or responsibilities before those of anyone else. In Spanish, "numero uno" literally means "number one," a common euphemism for oneself. The only way you're going to get ahead in this business is if you take care of numero uno. It doesn't make you a selfish person if you look take care of numero uno from time to time. Just don't do it to the exclusion of other people.