Black mirror movie


I’m into black mirror and I really want to watch the movie (Bandersnatch? I forgot) that recently came out but I’m only about halfway through the tv series. Do I have to have watched the whole series first to understand it/ are there spoilers, or will I understand without having seen it all and still be able to go back and finish the series. I’ve avoided all the spoilers I’ve come across and I’m too scared to google it bc I want it to be a complete surprise!!