Perform a Two-Step Replace
The Problem:
Okay, picture this: I've got a 500-page document with several thousand references to our product, the Bovine Super Defibrillator. Only sometimes it's just called the Super Defibrillator. I need to change all the instances to "Bovine Super Defibrillator." But if I do a Replace All, all the instances that already have "Bovine" change to "Bovine Bovine Super Defibrillator," which I don't want. And if I don't do a Replace All, I need to accept or reject the replacements one at a time.
The Solution:
It's okay. Do the Replace All. Then do a Replace All of "Bovine Bovine" with "Bovine." Problem solved.