The battery can be done at home if you have the tools to do this. Its a bit of a strip down and you need to reattch the wires with connectors once the battery has been fitted.
If you dont have the tools and abiltiy to do this then you will need to get an engineer to do this.
If you are looking at doing this yourself then i have the fitting instuctions that shows you how to do it and what tools you need. If you want this let me know and i will upload it for you.