please don't do that
i know u didnt ask for that but i'd say it first thing. I did read of a few cases of auto-orchiectomy that were "successful" but in all of them the person had to receive emergency care, because it can get quite bad. I don't know the exact timing if you were to bleed to death, but there is a high risk of hemmorhagic shock, and you would bleed a lot. But since in all cases the person made it to the emergency room (i guess i haven't found the ones that didn't) pretty sure you'd be calling for that pretty fast...
it also came to mind but the heavengate's cult also performed clandestine castrations that almost killed one of its members, infection can get bad too...
I feel you there, just giving you whatever lil info i had, but not endorsing you do that, at all. I imagine wherever you live the healthcare system must not be an option, i'm sorry for that... and that you even have to start considering this. I won't pretend to offer alternatives or know best, I just really wish you don't have to resort to this as it can end bad easily, in a way you would regret, neither achieving it nor dying... so i have to say that. I'm sorry, big hugs to you
also this is just more awful dangerous advise wtf...