Are you doing this where you live? Someone who knows your address might be able to send emergency responders to your location fast enough to keep you alive, but not fast enough to prevent brain damage, possible quadriplegia, and other bad shit. Also, the livestream will absolutely get zucc'ed.
This does not look like a well-thought-out plan to me, and it makes me concerned you may be acting impulsively. I'm not asking you to justify your reasoning to me, because it's not my business. Nobody appointed me Suicide Gatekeeper of the Day. However, I'd feel like an asshole if I didn't point out that a lot of people who attempt impulsively and survive end up glad they didn't die.
At the very least, you might want to think about this plan some more. If Sunday comes and you still want to ctb, you still can.