This isnt particularly difficult to do at all... Just take the panel off, carefully remove the grey section (go easy as it is thin in places). Remove old bulb, solder in new LED, with the CLR in the feed to the plug (much more room then). I did this, and also painted the grey bit black, to match all the other panels, dont know why VW made it grey!
All this is from memory, done about three years ago, so instructions are a bit vague...