Not difficult to do just a little tricky to have it not feel like you're suffering. The quickest is with a "long drop", this was the method used in judicial hangings, the goal is to break the neck for a near instant death. Since most people don't have a gallow, the other hanging methods rely on cutting the supply of oxygen to the brain. The goal here is to constrict the carotid artery and lose consciousness quickly. You'll have to ensure you'll not be discovered for as long as possible to ensure death. If you're saved before 100% brain dead, you'll have permanent damage and be in a worse position than you are now. If your carotid artery isn't constricted, you'll strangle yourself which is painful and relatively slow.
Whatever you decide to do, don't do it on a whim. Spontaneous attempts don't always end as intended.