Well, you have to be brain dead to die that's sth that is inevitable to be successful.
Ig you think about failing an attempt with brain damage? Unfortunately all methods can fail in the one or the other way, especially when being rescued and someone interferes. All you can do is plan your attempt as good as you can and make sure not to be found too early.
Full suspension is usually fool proof and only a question of time once you kicked the chair, unless someone interferes or the branch breaks or the knot loosens and you fall down.