If you've got the proper VW ones then they come with instructions.
I've got them on mine although the front ones were fitted by the supplying dealer. If you have to do any drilling then it will only be the plastic wheel arch liner. Cordless drill will do the job.
I fitted the rears myself. Piece of cake although it takes some time as you need to jack it up and take the wheels off to do it. Took the rear flaps off in the end, because they look pretty poor.