Nice overview. Well thought out. Missed a few details, though. I found the transmission lines to be hard to get to and difficult. The upper transmission-to-engine block bolts were very difficult to get to. It would be nice to have heard if the starter can stay or must be removed. Apparently you were not aware that the transmission shift linkage can be disconnected from the metal arm without tools - it is snapped on and will disconnect if you push/hit the plastic end horizontally towards the tranny.
I hope he is still wrenching. Kids got the right attitude and patience. Working on cars/trucks/equipment etc is a good living right now. He could be running a shop or own his own by the time he’s in his late 20s early 30s
Do not remove the starter do not remove the intake box there is no reason for that do not mess with the exhaust the bolts will break and you will be stuck doing a bunch of extra work you don't have to do the transmission will come down and out out moving exhaust components
2002 and up you do not have to remove the starter theres a hole for a screwdriver to fit in and the ratchet or breaker to get the three torque nuts the starter bolts do not go through the trans either the are on the motor the motor and or trans can be removed without touching the starter but you do gotta remove the wires from the starter
I can tell you, you dont have to take the starter out out the exhaust and the shift linkage is best to disconnect from the shaft not unbolt it so all that screwing around for no reason