Oh, yeah, Radical Acceptance is haaaaard. I've only really been successful at it a few times, and every one was preceded by a time period of fighting an unwinnable battle and anger over my own helplessness. But I know, for example, that once I accepted that I was going to be taken off my daily narcotic pain meds, and stopped raging and crying about it, my life was definitely improved, and I can regard the future with more equanimity on that issue. The language in the whole response reminded me very much of my DBT class.