I’m no master here but in my opinion, It definitely is an easy-to-use program If you know Photoshop. If not, it’ll take a while before you understand it completely.
That doesn’t mean you shouldn’t research before using it 
I’m self-taught and I had no problem learning it thanks to YouTube! I totally recommend watching a few videos on YouTube to see if you like the software.
Also, If you decide to use it and have any problems working with Substance Painter, you’re always welcome to DM me.