Plain-sailing

[…] I took an uncommon fancy to him. He's a straightforward, plain-sailing fellow. I shall be very glad to see him again.

[W]hat was the mainspring of her mind—round what axis did it revolve—that was what puzzled him. Clearly enough it was not like most women's, least of all like that of happy, healthy, plain-sailing Bessie.

But the plain-sailing tradesman who must be taken as the typical manager (for the west end of London is not the whole theatrical world) is by no means equally qualified to judge whether a play is safe from prosecution or not.