Stand against a wall or a pole and work to defend yourself (using a knife as well as your body and mind) and get away from attacks where you have to also draw the knife from various positions such as with the other hand, From your coat, from your back and so on. See how you can move to avoid getting hit as you draw the knife if you feel you will use it for intimidation or cutting and remember your life is more important than the knife. Be mindfull of your breathing and keep your eyes relaxed.