Yes, you are correct. It is likely the various steps are a bit different on each model. If I recall I was likely working on a 2015 or older system. If there’s a shield in the way, I can’t think of a way you could get around it without pulling the logic board.
The CTO Apple SSD drive is located underneath the Optical Drive on the right. If you’re checking for it’s location, follow the steps to remove the Optical Drive instead, then you’ll find the SSD underneath it.
ej P: remove the fan assembly first. Then remove the connector that runs from the iSight camera to the logic board on the left.
the RAM is located right near that cable. It’s tricky to remove but you can pop open the connectors with a black nylon stick and the RAM chip will pop up at 45 degrees. Make a mental note on which way you will need to install the new ram as it’s tough to see. For the Crucial memory I got it was label side facing away you (facing towards rear metal enclosure).
the second chip has a plastic adhesive piece on it that you should probably attach to the new ram.
remove both chips then install the new ram in sequence from the board out.