1. Yes in theory it should be peaceful. Because they are CNS depressants, they will first depress (slow down) your brain activity, so you will become unbelievably sleepy, and then just pass out. This is importang - you would drift into unconsciousness, and wouldn't even know ("remember") it. In hospital, before a surgery, they give you Midazolam, which is a benzodiazepine and it helps to sedate and calm down patient, who may otherwise panic of be very anxious. Also it kind of messes up the short term memory, so often memories from just before the surgery are blurry.
There are many kind (in every country like 20-30 benzodiazepines) sold in pharmacies, like diazepam, alprazolam (xanax), estazolam, lorazepam, clonazepam etc. Plus not benzos, but very similar hypnotic "z-drugs" like zolpidem, zopiclone, zaleplone. Besides them, there are RC (research chemicals, grey zone, not yet banned fully, so sometimes you can get them in some RCshops, both online and offline) like etizolam (at some time I know it was legal in pharm use in 3 countries; Japan, Italy and one other I forgot), flualprazolam, flubromazolam. RC is bad in this sense that you aren't 100% sure about what's inside, and dosage. Also, benzos alone won't kill you, they are used to potentiate opioids, there is incredible synergy between them. Also they help you calm down, relax and sleep, which is what you want.
2. There are different type of opioids/opiates (opioid is a general term for synthetic and natural ones: substances that work by binding to opioid receptors; and opiate is a term used for natural substances derived from opium poppy seed plant. Many people don't know the difference or use them interchangeably, but this knowledge isn't all that necessary). It is Opioids that kill. Benzos are used to potentiate. Opioid alone can kill easily, benzo alone will not. The best is of course to mix, as big the dosages as possible.
3. There are weak opioids, like codeine, tramadol or dihydrocodeine. Don't plan to CTB using these. The medium/strong ones are you go-to substances. The best well known baseline is Morphine. Similar strength opioids are oxycodone (oxycontin), hydrocodone, oxymorphone, hydromorphone (dilaudid) etc. Also heroin is about 1.5 - 3 times stronger than morphine, it means you just need less dose of H, or higher dose of M.
And there are super strong opioids, like fentanyl and its derivatives, like furanyl-fentanyl, once known and synthetic U-47700, and the most potent (used to anesthetize elephants) carfentanyl or etorphine, but it's hard to get them.
4. Morphine for example is sold in various forms, take tablets for example, here you can get it from 20mg all the way up to 200mg. The reason is that patients using this drug for long term pain management (like cancer etc) will develop a tolerance. They (and all opioid naive people) will start with 20-40mg but after year of daily using, they organism will get used to it, and to achieve same effect they'd have to use 200-400mg (*the numbers are very rough estimate. I provide them to explain you, why some people die after taking 100mg, and others use 1000mg daily and are ok).
This is why tolerance is extremely important. If you have never taken opioids regularly (not counting the 20 times you done codeine or tramadol with your friends years back, what counts is a regular use, addiction and tolerance), then I'd estimate a 100mg tablet has 10-30% of killing you, a 200mg 40-50%, and few 200mg tablets (800-1000mg) is a 98-99%. If you add benzos on top, it makes it almost certain, like 99.9%.
5. You don't have to inject it (although a pill could be crushed, heated up, filtered, taken into syringe and shot)- bioavailability of an oral use is 30% for M, for oxy its 80-90%. But even that 30% is enough if you do massive OD, like 1000mg for a non-tolerant person. What IS important, is that those 100+ mg pills, are "CR" which is Controlled Release or slow release, and to maximize your chances, you should scrap the film off (with a nail or a knife etc) and then crush your tablet into small pieces, or even better to a powder. Take your benzos 15-30mim prior, and be aware they can knock the shit outta you before you realize. This is why 15-30min is best, 45-60min may be too early. Take it ideally on an empty stomach, use normal water to drink.
6. Mechanism of CTB is: first you get unconscious (your brain function is very slowed, like in those drunk ppl), and it should be somewhat pleasant feeling, I mean people use opioids and benzos to get drugged (I use them a lot, and the feeling esp. for the first time is amazing- all your problems go away and you feel like you are covered with a hot blanked of love- the distinct warm feeling from opioids). However, given the massive OD, your organism may react with vomiting or nausea, you will lose consciousness though. Quickly followed will be the substances action on breathing reflex area in the brain. It's an involuntary action which we continue to do while unconscious. Opio and benzo will slow it down / stop completely and you CTB while unconscious. You don't even know you just CTB'd. You don't feel panic, you don't feel gasping for air, no air hunger at all. The feeling ideally should be like you were given general anesthesia in a hospital, and never wake up.
*Important note: if you are getting your opioids from your street dealer or an unknown source (not a pharmacy), get it tested. They lace it with unknown shit, and if its fentanyl, well, better for you because it kills faster, but it could be other tranquilizers like xylazine, which you dont want. Also to boost up the price, they will tell there is 200mg, and in reality there could be 50. Which will definitely affect your CTB plan. So either get it from a trusted source/pharmacy, or get it tested.
Good Luck, I think opio+benzo method for someone naive (non-tolerant) is one of the best options, besides N. Very reliable, very clean and almost pleasant.
However OD statistics are so bad bc people dont know what theyre doing, they want to CTB on an OTC drug like acetaminophen, paracetamol or ibuprofen. Or some antidepressant or cardiac medication. They also dont know the dosage, just take a blister or a handful of pills. They don't use a combo that potentiates each other. Believe me, I read a lot of real stories / case studies, and many doctors chose to CTB with opio/benzo method. If you have other depressants, like alcohol, barbiturates (unlikely that you have them), GABAergics/anticolvulsants like pregabalin or gabapentin, clonidine, quetiapine etc, they can help as well. But the "must have" core is an opioid and a benzodiazepine.
