I ordered the complete ice maker assembly since I was unsure if I could simply replace the tray efficiently or correctly (yes, I could have). It turns out replacing the entire assembly was probably faster than replacing the tray.
I'm fairly mechanically inclined but had no experience or knowledge of icemakers. The entire process was completed in 20 minutes, but most of that time was spend removing trays from the freezer and removing the freezer door (bottom freezer style that pulls out as a drawer).
This was a very simple process: remove the freezer door and internal trays, then remove the 2 Phillips head screws securing the icemaker to the freezer, gently slide the icemaker forward off of it's mounting post, tilt it to the side and unplug the harness.
Installing was just as easy: connect the new icemaker's wiring harness, slide the unit into the mounting stud, install the 2 mounting screws, and finally press the test/reset button on the bottom of the icemaker.
One piece of advice I found on my freezer: my freezer has two drawers. It is easier to install the door and the bottom drawer before reinstalling the top drawer.