I don't want to advise I just want you to hear my plan.
Like yourself I've had past attempts that have failed through my own fault, "chickening out" halfway through and have been found and saved.... Those times were through pills.
This time I plan to jump.. but beforehand I plan to get rid (spend or what ever) every penny I own, make sure I have nothing to go back to, house, people etc, so that at the moment I get to where I plan to CTB, it would be too hard and too stressful to turn back thus the idea being the better option for myself just to CTB like planned.