If you can't turn in a circle with your mouse, your sensitivity is too low. Crank it up until you can do a 360 comfortably without lifting it and repositioning. I have no idea why this advice suddenly became "lower the sensitivity and just use your whole arm across your whole desk" but, that shit sucks. Especially if you don't have room.
It's a good idea to disable acceleration and, when possible, use RAW input for the mouse so it moves 1:1 with your hand. You can do this in most competitive heavy games, and you might want to also disable acceleration (mouse smoothing) in Windows' own settings.