The isight cable in the top right corner: I don’t think yours is installed right, it shouldn’t be going over that rubber grommet, it should be going to the left. Your cable is all stretched. I don’t see why steps 20 and 21 would be necessary, except temporarily to remove the screw. Step 31: My inners are T9 and my outers are T10. Also, I wouldn’t rate this as a 3-bar difficult. There isn’t even anything glued in, you don’t need a heat gun or adhesive remover, no special tools besides the pentalobe bit are required. Estimated time 30-60 minutes.

I don’t see why steps 20 and 21 would be necessary.