If you want to execute maintenance for your ATK 450 XC then it is always recommended to have a Workshop Manual for a guide in the event that you need to know how you can strip off a certain component for example the Brake Pads and fit it again the right way.
ATK 450 XC Workshop Manuals provides targeted diagnostic guidelines for your vehicle so if something is not working it will help you understand what the issue is and tips to resolve it. You will be able to decide if you can do this by yourself or in the event the job is just too big you can still make a reservation for your 450 XC right into a suitable repair garage.
ATK 450 XC manual