Thank you for the excellent instructions! I was able to finish in ~40 minutes, despite having difficulty opening the bottom case for a while (the seal was good and sealed :).
There is a plastic clip holding down the motherboard in the corner opposite to where you’re prying. After lifting slightly, the motherboard should be slid out from underneath that clip to avoid damaging it.
iFixit didn't mention the new, much larger (and therefore louder) speaker thanks to the removal of the Apple Loop connector! That's a real win!