I would do the postal exchange option and use a local indie garage to do the work.
How easy is the drop and how long should it take to carry out? Is there anything I can say to reassure a “nervous” mechanic?
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It took me about 35-40 min, but allow yourself about an hour. I watched a few videos on You tube, some of which showed you what not top do !! lol. Get yourself some plastic trim removal tools, take your time and it's not too bad to do. One thing I did do, that wasn't on any of the videos was to spray a small amount of silicone spray on the fixing lugs of the plastic silver surround before I started prizing it off. I've just seen the reply about the marks to line the wheel up.
The line, to line the steering wheel up on the steering wheel coulomb, was identical on my old wheel and the one I had refurbished.
This is the wheel I had refurbished, if you look at the hole at the top at the 12 o'clock position you can see a line that is put on during manufacturer , this is what you line up with the line on your steering coulomb to get your wheel in the right position

