pick up box, label and post with international shipper

I am looking for someone in Munich, Germany to help me with a project that is for personal use. The project involves picking up a boxed item, labeling it and posting it out with an international shipper. The box will weigh between 5kg and 10kg and is being sent to an international destination in a different continent. I'm looking for someone who has experience dealing with international shipments and who can provide the best advice and service.