No one escapes the pain of going through so much bodily trauma that your body tries to go on hi-drive unless you have that natural willpower to, and it isn't easy for just any normal person to have.
You have to be almost crazy and insane to make it happen, but there has been people who actually did it with a goal because they desperately knew they were tired and knew the risks involved.
I think it's about preparing yourself for the outcome when your the most prepared, but the chances of not making it the first time would mean dealing with the consequences and why almost everyone don't try again.
I'd say if you are confident with it working and you have the ability to also get it done with sheet willpower and mental resilience, you can do the impossible, but if you are confident with your plan and already living in a limbo of suffering that you only know enough about for your own, please by God's grace, don't let yourself fail with the consequences if you leave being guaranteed a peaceful ctb for your own sake