Audi A1 Drive belt tensioner

[K27THB]

Hi,

Does anyone have a guide on how to change the drive belt tensioner on a 2011 Audi A1 1.6 TDi CAYC?

I have the parts, just unsure if it’s a case of taking the wheel and hub off and going that way or if it’s possible from the engine bay.

Any one changed this and got any advice?

Thanks