i don't know if that is entirely, reliable, practical, or peaceful. i took 3×10mg yesterday for relieving anxiety (trembling and shaking) and my god did my head feel like it was going to burst. adding it to the sn method/regimen alone is already an unknown because it's only meant to slow down your heartbeat bc of the adrenaline due to difficulty of blood carrying sufficient oxygen throughout the body.
now imagine if that nausea was increased, say, tenfold, because you take 1 gram. and it's not even a guarantee that it's reliable because taking drugs like that for overdosing is dangerous bc you might end up a vegetable or because the ticket dose is an unknown variable and/or varies for everyone / is not necessarily that researched yet. in general OD'ing is a non-method unless you've found some magical mixture that's peaceful and reliable — a drug cocktail or a self-created method, but even then there's caveats and you need to research more and do some premeditation which takes time
on that note, i think i read there was a method with propranolol mixing it with a drug cocktail in the PPH. but afaik you need other drugs. if you have 1.7g propranolol and there were cases of lethality by consuming 2g, then you would need more, and even then there's no guarantee it's peaceful or reliable. peaceful is certainly out of the question: that "nausea" sounds fucking painful as fuck, because again just 3×10mg was enough to give me a headache. additionally the dose may vary from person to person.
you may be hampered by your location or other factors from purchasing more tenable, reliable, or generally better options like SN, N, drug cocktails, barbiturates, opioids, etc. but i highly suggest researching other methods first or buying other method components to add with the propranolol like a drug cocktail (research PPH for this one). OD'ing with prop. sounds painful asfk and i highly suggest you rethink your method before using it as a bus ticket
i understand if you'd need to ctb soon for personal reasons, but by god, if the only thing that's pushing you to do that is yourself and not external factors, i suggest you biding your time first and being at peace with your time of dying. pushing yourself to ctb while still not ready is risky and often has little to no rewards + add to it the fact of your SI taking over and through the unbearable nausea of a propranolol overdose is you suddenly deciding it's not your method
rethink some things, pls