Bleeding to death (aka exsanguination, which means severe loss of blood) is a very difficult method to get to work- the movies make it look like a reliable method, but it is very difficult to get this to work in real life. According to a paper from Harvard called "Lethality of Suicide Methods" cutting has a success rate of 1.2%, which is the lowest of all methods studied in this paper. I think a person needs to know anatomy very well or just get really lucky to get this to work, since the odds of this working are 1 in 83 - this is based on attempts in the u.s. from 1989 to 1997. It is easy to find this paper if you search for this online- in case you want to see more details. I am saying this not to discourage you but to help you to avoid a failed attempt, which can lead to involuntary hospitalization, which most people don't want. I agree that it is probably not too painful if you can get it to work, it's just not that easy to do this. Best of luck, though, I've been researching for a while and I still not certain of a method, though I have narrowed it down some. It is against the rules here to "encourage acts", which seems to include recommending methods, so I wish you the best of luck for finding peace however you may choose.