smooth sailing (uncountable)
- (idiomatic, uncountable) Used to describe an activity that is not encountering any problems.
- Synonym: plain sailing
It's all been smooth sailing; everything has gone exactly according to plan.
We had some problems at the very beginning, but it's been smooth sailing since the second week or so.
2013, Thomas Doherty, Hollywood and Hitler, 1933-1939, Columbia University Press, →ISBN, page 315:
Not that all was smooth sailing for MGM in Nazi Germany.