2003 mitsubishi nimbus/chariot help wanted.

Hi guys, I’m working on da family van and the local mechanic told me that the spark plugs needed to be changed. I didn’t want to pay a couple of hundred $$$ so I told him I would do it. Lol kind of regretting it now, haha but never the less I am jus asking for a little advice on how to go about it. I’ve youtubed it an have a fair idea on how to go about it, but just thought I’d ask the pro’s!(all of you guys) thanks for anything you can help with.