Are we talking about the outer door seal? I replaced the one on my fiancee's polo (different car - exactly the same principle) in about half an hour, took quite a while to get the old glue off the door properly. Part cost about £30. I havent' looked at the golf seal in detail but I cant see why you would have to take the door off. Take a good look at how the seal is routed around the perimiter of the door and then try it yourself. If it doesn't go well is only £30-40. The seals have a self adhesive stip on the back - you just stick it on where the old seal used to sit. Remember the holes go at the bottom - this will make sense when you see the strip....