As per title, great if you know or have a fair idea. But if your tools or knowledge is very limited, then you should just bring to someone that has the knowledge, as you will make a very exspensive mistake, very handy.
Purchased this for boyfriend as his A5 is suffering battery drain. He has found the diagrams extremely useful in locating and understanding how to remove and replace the faulty part.
The guide itself was sent as a link to download very soon after purchase. It was quick and easy to do.