Hi, I have the IWC PORTUGUESE CHRONO with A79350 movement that I got from Mary. The hands look weird with some stains on it and I want to replace them new hands, but I could not find any manual how to handle the A79350 movement. I'm a total noob in watch repair and I don't know if this is over my head to replace hands on a chrono movement, so please advice me how and also if I should do so Thanks!