Thanks yet again, iFixit! I am not an expert by any stretch of the imagination, but your clear, explicit directions always make me feel like one.
The repair proved even easier than the "moderate" difficulty rating would suggest. The entire process took me about ten minutes—far less time than it would take to even drive to a repair depot or Genius Bar.
Also: I was unable to locally source a spudger or T6 Torx screwdriver, and couldn't afford to wait. No problemo! I was able to easily disconnect the MacBook battery using my fingernails. Also, because the Torx screws protrude slightly, I was able to unscrew them (and screw them into the new drive) using needle-nose pliers.
My new drive is now formatted and being restored using a Time Machine backup.