The screws can be really tight. Be sure not to strip them, like I did with one of them (got it out luckily).

The colors of the dots before the paragraphs do not match the colors of the circles on the photos. It may be confusing.

To remove the trackpad/touchpad, you can skip a lot of steps here:

4, 5, 6, 7, 8 are for removing the keyboard, which isn't required to swap the touchpad.

14, 15, 16 are for removing the top RAM stick.

22 to 41 are not required (so continue with step 42)

44, 45, 46, 47 are not required either.

So to replace the touchpad, do these steps:

1, 2, 3, 9, 10, 11, 12, 13, 17, 18, 19, 20, 21, 42, 43, 48, 49, 50, 51