Hello, even if it is a noob question for some of you here – so I would like to ask for safety: How do I change the spark plugs best at the Volvo855 Bj. 96. I’m not clumsy by hand – but I don’t want to do anything wrong. And somehow I can’t get there properly. Do I have to dismantle something first? Do I have to pay attention to anything else? Thank you for your help