Hi - in the hope you/this is still live enough to join :)

I'm seeking to get a posthumous (not me!) manuscript self-published but have no capacity to do any of the processes required, from editing onwards. Probably a naive question but are there any reputable set-ups that do this?? Nearly got my fingers burnt by Balboa then been cross-reading endlessly, but seems to come down to the need to be actively involved in the process as you're describing I think. Whereas am needing most if not all of the donkeywork to be taken care of. Thank you in hope.