So, there is a serious inability to access individuals that have attempted different methods, for obvious reasons. I would do some research. Based on this website:
Information on most lethal methods of suicide, and how they have been ranked in terms of pain. Plus info on things to consider before trying popular methods.
lostallhope.com
Hanging approaches 90% efficacy, and jumping from a height a bit higher than that. You're method seems something in between. So I would guess that, if done correctly, you would be pretty effective. Now, will it hurt is a much tougher question. Depends on the height you jump from, the noose, your weight, the elasticity of the rope.
Based on historical hangings, the death would be quite painful and could last 2-3 minutes. However, if you die by the drop, it will be painless. This article below talks about a brass ring behind the ear that would snap the vertebrae. I had trouble finding any details of how this worked. But I'm sure with some research you could figure out how these devices were set up historically to minimise pain.
“Executions are so much a part of British history that it is almost impossible for many excellent people to think of a future without them” - Viscount Templewood, In the Shadow of the Gallows
www.historic-uk.com