Wing it

I don't know their system, but I think I can wing it.

I didn't study for today's test, so I'll have to wing it.

Plus, early in a career, bands are typically winging it from a creative standpoint; after awhile, acts figure out what they’re doing right (or wrong), and are more deliberate about songcraft and execution.

“My [worry] is that after a week or more of mismanagement, I’m deeply concerned the government has made a difficult situation 10 times worse ... There is a growing concern the government is now winging it,” he said.