About as complex as a Mac gets in the modern era :-)
I struggled with re-engaging the ZIF socket for the microphone. Patience won out.
Re-seating the rear ports took a little effort; tolerances for USB-C is less than the motherboard screws. I wound up loosening all the MB screws, fully populated the rear USB/Ethernet/etc, then tightened them.
Having the correct tools definitely helped. The pizza cutter and Service Wedge makes quite the difference. Well stocked with iFixit tools here, but purchase of the adhesive package definitely helped the build.
