Pretty much as above, thanks. A colleague has spent years behaving unreasonably at work, and has recently put a lot of effort into acting as if they are my senior and implying that they will have management responsibility over me in the future (not a chance). I have been very subtly demeaned and experienced low level bullying from this person, and recently decided that a line had long been crossed and it was time for me to formally resolve this. I'm quite sure that this is the right plan, despite feeling very sick about the whole situation. It's taking such a long time to get going, and I feel so very underhand knowing that this is coming but that the colleague isn't yet aware. Any advice very much appreciated, particularly re how to keep my spirits up and not make the next few months all about this. I have lots of nice friends and activities, so I'm not feeling isolated, but I feel as if I want to talk about this all the time.