be no picnic
US /bi noʊ ˈpɪk.nɪk/
UK /bi noʊ ˈpɪk.nɪk/

1.
to be a difficult or unpleasant situation or task
:
•
Raising three children on a single income is no picnic.
•
Working in that environment can be no picnic, but someone has to do it.
to be a difficult or unpleasant situation or task