There is a lot about this job that you learn on the fly. In some cases that is fine, and in others you take your lumps at the start and roll with it. IMO, it is the management side of things (both financial and personnel) that becomes one of the thorniest things to juggle, and which has the potential to surprise again and again.
Anytime a management issue comes up it is, often by definition, a difficult issue to grapple with. There are competing interests and possible career-altering decisions to be made. But doing nothing is also the greater of evils, and so it goes.
I have often gotten the advice to always focus on doing what is right for myself and the lab, but fortune cookies never give or get context.