Activity 1: Creating an Inverted Cut Pupil problems

so I am currently following the tutorial to create an eye, and copying the nodes as he says. but the video states to DISABLE the layers EXCEPT the overlay, when making the blink(in vid 2), but in the third video, he edits the line art layer. I cannot follow properly, and have redone the eye multiple times and re-watched the video a half dosen times. I’ve already problem solved a issue with cloning nodes vs duplicating, but can’t work past this part. has anyone else had this issue? is it a problem of harmony 16 vs older versions?