I'd say there's a good likelihood of success, but it isn't 100%. Things happen. And if it isn't successful, be prepared to be really messed up for a really long time, probably permanently. You might be so messed up that you'd be unable to ever even attempt to do anything again to end your suffering, or your new suffering. Wouldn't be my first choice. Not sure what I would do if it was the only method really available to me, though.