Hi, I just tested with my T480, and the replacement looks exactly like this T580 guide, and is very easy in fact.

Open the shell, remove the battery (3 screws), see 3 of the 4 screws of the trackpad.

The fourth one is below the black plastic that you can see on the guide, and you can just lift it up. So you can move from step 11 to the end, the 4 screws are in fact directly accessible and changing the trackpad takes 1mn.

I don’t think I have a special T480 model, so if you are frightened by this guide, don’t hesitate to open yours to look… you may have to spend only 5 to 10mn on this operation :)