yes, but it is difficult and quite painful. in term of cutting it's best to go with the arteries in the neck, it will knock you out within 10-20 seconds (maybe a bit longer if you are not lucky). With the wrist, you will most likely start to panic after a few seconds as your SI kicks in, also a lot of people have a misconception about this, arteries are very deep in your wrist they are pretty much right next to your bone so you will have to cut very deep before reaching them, the pain and the blood might make you struggle to fully commit and you will just end up with a failed CTB and a lot of unnecessary pain.