I've been under pressure recently to get some essays marked on time, and I had a tight deadline. It's all done now - thank God, but the pressure was getting under my skin. However, I was told a technique which can be employed when someone is getting to you.
Imagine a window which has dirt on both sides. There is your side of the window, and there is 'their' side of the window. When you are wiping your side of the window, a smear is produced - you should smear it vertically. When you smear the dirt on their side, wipe it horizontally.
So their smear is horizontal and yours is vertical. Keep their smear on their side and yours on your side. They are separate.