It's a difficult feat, that.

Earlier this month, after several attempts, it also pulled off the fantastically difficult feat of retrieving a first rocket stage by landing it vertically on a drone ship.

He called it his most difficult feat to date, and remarked that training was very difficult.

The film became the most difficult feat the director ever tried to pull off.

With the exception of the period from 1940 to 1948 this enabled direct services to operate on a daily basis, although wintertime conditions often made this a difficult feat.