Does gua sha help reduce swelling?

I heard that if you don't do gua sha properly, it can actually make things worse, so maybe that's why everyone else is practicing it so diligently, but I haven't tried it yet. I tend to have a lot of swelling, so I'm wondering what it would be like. Will it be okay if I use it correctly? Is it okay if I just follow along with YouTube videos? Please share some tips on how it went for you all.