I mean. Do you know an idiom which means, something is not easy or it is difficult?
be a [real] uphill slog/be a slog
be tough as hell
be a task of monumental proportions
be easier said than done
be a pain in the neck
be no easy pickin's
not an easy task/job/decision
not the easiest ... to do
be a tall order
a daunting task
be murder to do sth
backbreaking
There are more, B, depending on the area of meaning.