Step one would be disarming the poor to minimize resistance. This has already been done pretty much everywhere on earth with the exception of American, Africa and now Afghanistan. I would expect it to happen in America fairly swiftly over the next decade because of the wealth concentrated in that region.

I would not expect a mass culling based on net worth or skill set, but culling individuals based on behavior analysis is quite likely. When predictive AI is skilled enough to identify individuals with mental health issues early, mandatory treatment will become a thing. It would also make sense if the people that can't be cured with 100% reliability would "disappear".