I’ve tried to search for it but can’t find any instructions on how to remove the step insert from the n/s rear passenger side. Is it a push or screw fit? I’m not the most adept at taking things apart and I don’t want to break anything in the process, so any advice in easy removal would be gratefully received.  

if youre talking about the plastic step just inside each door, they are push pins, just have to carefully tug the step up, or use a pry too to carefully wedge the step up