Its really pretty straightforward.
Remove the fuse for the horn (fuse box under the bonnet) and take your time.
Pop off the airbag (there are 3 spring release clips at the back of the wheel) and once off, just unplug it and leave it to one side. Don't worry, it doesn't cause any dashboard errors once its re-connected.
The silver/red plastic trim is only clipped on but takes some gentle persuasion to prise off. Start at one corner, tug gently with your fingers (around the haptic buttons on one side) and once you have that side freed, the rest is easier.
Once the trim is off, you'll see the Torx screws you will need to undo to remove the existing paddles. You also need to unplug them. The new paddles are a direct swap, same torx screw, same plugs.
Put everything back in reverse order!
It's well worthwhile doing, makes the wheel look so much better and the paddles are really nice in the hand to use.
Exactly as Joe has said there.
The only point I’d add because it confused me at first.
The airbag springs, there’s a round peg and a straight bar going through, you use a terminal screwdriver to leaver the bar towards the centre of the steering wheel. I used my phone camera on “selfie” to see what I was doing. There’s also, three not two as volkswizard said.
Also, if you unluck the steering wheel reach adjuster, pulled fully out and fully downwards will give you maximum space.
Lastly, as joe also said, on a fast twisty road (I’ve been out today) the difference is massive, so much nicer to use through the gears. Oh… and if you’ve it tried, “special” mode on a twist road is fantastic!! I am thinking of OBD11 to disable the sound imitation thing though.