Ok easiest way:
Centre steering wheel, loosen 24mm bolt but leave it threaded, yank it loose then remove bolt & wheel
Remove lower ign shroud - 2 screws
Unplug all stalk electrical connections, and the ignition stalk plug
Remove hex bolt securing metal ign housing to the column bracket
Remove dash under tray - several screws
Remove nut & bolt at the bottom holding the column to the universal joint
Pull column/ign housing/stalks etc out as a complete unit
Now flip it over and you should be able to see the back of the ignition switch, along with the screw securing it to the housing.  Using a small screwdriver remove the screw and swap the switch over.  Its fiddly but doable!
Don't worry about removing the column, it seems very scary but it will only fit back on one way due to a notch cut out of it for the UJ nut & bolt to pass through.
The only thing to worry about is getting the wheel on straight, which is why I suggest you centre the wheel at the beginning before you remove it
