The same way I use a computer mouse, suboptimally with my off hand, but it was the only option when I was learning as a child and now I'm stuck because it works well enough. I think most lefties have decent capability with their right hand because it's occasionally unavoidable to use it for something.

as a right handed how the fuck do you cut stuff, it was the crappiest cut ever

That is how us lefties feel using right-handed scissors.

You have to uncomfortably hold it and push the top blade with your thumb intentionally so the blades stay together properly. That or you just have to use the other hand if the scissors are to loose, its a pain in the ass lol