Well, it's fairly major surgery that I'm a bit skiddish about, and it voids the warranty.
If you've seen the insides on the prior MBPs, you basically have to take the whole thing apart, down to taping a wire across the hard drive that goes to the front of the case. It's a scary design, and voids the warranty.
I "chatted" with another person, who didn't seem sure. She said it was "recommended that an Appletech" person does it. She gave me the Applecare number. I'm not sure if she understood that I don't actually have the system.
Dang it. Without a user replaceable drive, I have to go with Dell. And that also means I need to keep waiting, as they still haven't upgraded their higher-end notebooks (possibly they're waiting for a mobile 8800GTX card?)