if a situation is no bed of roses, it is difficult or unpleasant.
It's no bed of roses, raising two kids on one salary, that's for sure.Life isn't a bed of roses, you know.
be no bed of roses
To be a challenging and/or unpleasant situation. Of course that project is no bed of roses—why else would they assign it to a lowly intern like me?Being around my ex-boyfriend is no bed of roses.