Hi and welcome to the forum
The chain and sprocket change isnt too hard. As other have said make sure to get a good set of tools, take your time, take photos every time you take something off so you can remember what way it goes back on.
If no one gets in touch your local dealer should be able to allow you to sit in on the changing of the change and sprockets allowing you to make notes, ask questions and find out how its done and pitch in, meaning when you go to do it on your own next time you have tools and the no how how to do it