Wifdasnauz

So this question is most definitely in the wrong area but I honestly don't know where to out it due to lack of knowledge. My name is Elysia, and this post is for my husband's 09 impreza wrx sedan. He doesn't exactly take care of it. It has become a battle between us as to him selling it for a newer model or getting it fixed. He's had it since 09 and never changed the spark plugs. I know bare minimum about cars, but everyone I have talked to has said that he should have changed them at least once. So for fathers day this year I bought him new spark plugs. Needless to say, they still haven't been changed. He says he needs the tools to change them. So I am wondering, do I need to buy him a special set of tools? I want to get a set and not just specific to spark plugs. So what do I need, and where can I find it? I know Subaru engines are different, but I wasn't sure if it meant different mechanics tools as well. Any help in the right direction would be greatly appreciated. And sorry for posting in the wrong area. I dotn even know where the spark plugs are, or if they are engine mechanical or just general engine or what.