I can't agree with some things from that text. First of all - it doesn't care, how steering wheel is standing - to unscrew it, best way is lock wheel by removing igniton key, and then turn until it locks. When u place wheel back in place, just put wheel on, and then drive a little bit, to place wheel precisely
Second - the way, how author of this text removed light switches, are dumb - u don't need unscrew theese two bolts - just release the one, which are holding switches, then pull switches away and unplug connectors
And second - I don't think that for air con removing is neccessary - I don't have experience like that, but i was ready change heater's matrix on neighbour car by detaching main part of heater [where is matrix located] from blower's part [where is air con radiator located] - there is only six clamps holding that two parts together - I think, it's no easy, but not impossible
Maybe I'm wrong