I've done this about 4 times on my golf, and its a piece of cake
1. remove the foamy bits either side of the rubber strip inside the engine bay
2. set the wipers to 'park' position, remove caps and remove wipers from splines
3. carefully lift an edge of scuttle panel off from one side of the windscreen, i personally used a piece of cloth to 'wedge' the scuttle panel off the screen (also means you clean in one go too!)
and as richn83 said, clean out that gunk from under the scuttle panel!