Hi everyone!

I've just bought my first Audi today! Having owned lots of cheaper, older cars its my first decent car! It's an 2005 (55) A3 TDI Sportsback.... everything is great! I love it! One small problem.... The driver side electric window button has had LOTS of use and is all chipped / scratched.... it really bugs me as I am such a perfectionist!! How easy is it to replace this button?? What parts do I need.... is there any guides? I could go to Audi; but it will likely be expensive!! Can anyone point me in the right direction please?!