like herding cats
US /laɪk ˈhɜrdɪŋ kæts/
UK /laɪk ˈhɜrdɪŋ kæts/

1.
used to describe a task that is extremely difficult to organize or control, especially because it involves many independent or uncooperative individuals
:
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Trying to get all the toddlers to sit still for a photo was like herding cats.
•
Managing a team of independent contractors can sometimes feel like herding cats.