Being fat, ugly lazy & out of condition I like to do things the easiest was possible.
Drain the fuel tank , remove the battery and drop the deck.
Find something to hoist the mower up with, tree, verandah post, kids swing set, don't matter.
Stand the mower on its bum the everything you need to get to is right in front of your dial.
Usually once whatever holds the gear to the shaft is undone the shaft slips back up out the way, bush gets replaced, occasionally they are bolted in from the top , then push back the steering shaft, align the steering , replace the gear and you are done,