Cutting
This method is often sought out by people who have seen it in movies or TV shows. It should not be considered a method, as it is only in these shows to play it up for the movies. With a success rate of ~1-4%, the odds are the opposite of in your favor. While they make it seem like you can take a razor blade to the wrist and peacefully slip into unconsciousness in the bathtub, in reality it is nothing like that. The human body is wired to not be able to harm itself in this way. In order to die from blood loss you would have to cut an artery. The arteries are meticulously located beneath several layer of muscle, tendons, and other tissues. They are not meant to be cut, especially not on purpose. Even with wonderful understanding of anatomy, such as healthcare workers, you would have a very, very poor chance of reaching them unless you were in a state of psychosis. If you attempted to, you would find yourself halfway there before realizing you mentally and physically cannot get yourself to go any further. Your mind will stop you without you having any control over it. Many people argue that if they get drunk or high beforehand they will be able to overcome it, however this would impair your ability to properly locate and cut to the arteries. The biggest risk with this method is permanent nerve damage to whatever area you attempt to cut. Depending on how deep you get before aborting, you may end up with severe scarring and potentially anemia or other blood loss related conditions.