We need experience.

And when we do publish the book I doubt whether we shall find out how to do it.

Possibly after many trials; but the thought is alluring.

It's a useful idea." He raised his eyes at last, and they were positively sparkling with pleasure, he was so interested.
"Was it your own idea ?" he asked Liza, in a friendly and, as it were, bashful way.
"The idea's no trouble, you know, it's the plan is the trouble," Liza smiled.

"I understand very little.