Sentence examples for immensely difficult to do from inspiring English sources

And if it was so immensely difficult to do that, might it be all too easy to slip back?

That's difficult to do.

"That's exceptionally difficult to do.

Difficult to do, you might say.

It's very difficult to do this".

"The mushrooms are very difficult to do".

"That's pretty difficult to do".

It's very difficult to do".

And it's not difficult to do.

"But it's difficult to do perfectly".

Nonetheless, it's difficult to do nothing.