We were looking to buy a defender, settled on Varane early, Madrid were willing to sell at a reasonable price, and the player was interested. Everyone's on the same page, so all you have to do is hammer out the details. That's about as straightforward as you're going to get.
Signing Cavani wasn't straightforward because he was signed as an emergency option when we couldn't get our primary target. You're right that signing Cavani, once we'd settled on him, was probably a lot easier than signing Varane, the complexity comes from the fact that we were working on another deal that, if completed, would have negated our need for him.