Fitted today and working perfectly. Used Method 1
Unfortunately I found this job a bit of an annoyance. My hands aren't small so I found inserting the new switch in and connecting the plug onto the back a bloody nightmare. After much determination I got the plug in and the new switch fitted. The old switch appears to engage whenever it feels like it.
The guide was very well explained and I rate it highly. Just don't be a idiot like me and damage the three ventilation knobs in the process