They do this a lot - many, many sections of my RV-10 instructions show one side of something (wings, rudder pedals, engine baffling, main landing gear, etc etc etc.) and then the instructions say something along the lines of "repeat mirror image for other side".
Probably saves 25% of the paper for making extra copies for the "other side" when all it would show are the same parts again, in mirror image.
My process as I build is to put a blue or red pen check next to each line item as I do it. Makes it easy to visually confirm where I am, where I stopped, what I skipped as needed, etc.
For sections where you follow the instructions and then do the other side, I put a check for the first side and a draw a box to be checked for the other side when I go back and repeat. For parts where I can work on both sides simultaneously in anticipation of the "go back and do the other side" instruction, I double check the parts where I did both sides.
Once in a while the "mirror image" gets a little confusing, since you need to think in reverse of the picture for dimpling or assembly or something, since the drawing shows one side and the other side would be mirrored. But you get used to it.