There’s definitely a learning curve to it. I started just by spraying some water to get a feel for how it works, then practiced painting some plastic spoons. There are plenty of tutorial vids you can find to get started and to use whatever brand(s) of paint you decide on.
It will be releasing on Steam and Xbox on the same day.
A lot of these Playstation trailers are borderline misleading. I don’t expect Sony to advertise for other platforms, but the way they present things make it look like a PS5 exclusive.