A: Several sub-assemblies have to be removed from the car. Items such as the headlight switch, trip computer button panel, heater / climate control, instrument cluster, stereo (if it's the factory unit), window switch module, any accessory switches (such as the T/C or ESP, bluetooth button, etc.), and if you have an Auto, the entire console needs to come out to change the lighting in the shifter and associated buttons (PWR mode, Active Select). There will also be a fair amount of trim panel removal and replacement. Once these items are out of the car they need to be stripped down, and have the globes (or existing LEDs) removed and the new devices soldered in place. The instrument cluster is by far the most risky - there's a long row of pins connecting the LCD display(s) to the main circuit board - these must be desoldered, and they must be desoldered PROPERLY. It's a "through-plated" board (techos out there will be familiar with that term), and if not desoldered correctly you can write off either the board or the display window. This will mean you're up for a COMPLETE NEW CLUSTER - somewhere in the vicinity of 400 bucks for one of those - and it's STILL GREEN!! The facia in the stereo is also a little bit tricky, but not quite as tough as the cluster. If your car has the dual zone electronic climate control, this is also a fairly delicate assembly and needs care. The bottom line is that you'll have to be comfortable with not only the soldering side of things, but also to strip a sub-assembly, noting how it went together in the first place, and then be able to put it BACK together. Don't forget to put all the screws back in when you're putting the car back together too - else you might end up with a rattle or two you never heard before.