1.
Each failed CTB is a risk. This applies to every method (not only SN).
With SN, the chance of permanent serious damage is relatively low compared to other methods, BUT problems can still arise.
Most people who failed did not complain about any serious problems, although there were people who had some problems.
For example, one person had a bladder problem.
In my opinion, CTB must be well planned and each person must take into account that failure may result in negative problems.
But as I wrote above, most people had no noteworthy problems.
In the worst case scenario, brain damage may occur, but I don't remember if there is any confirmed case of such a situation (I only remember one such situation, but I'm not sure).
The chance of this happening is probably very small.
2.
SN must be at least 95% pure.
Make sure your SN is as clean as possible.
CTB is serious and not worth the risk.
Another thing is that current "guides" take into account SN with a purity of >95%.
For example, the recommended dose is 25 grams of SN.
Less purity may require more SN.
A larger amount of SN increases the likelihood of vomiting.
Problems multiply.
Just try to get the right SN and everything should be fine ;).
3.
SN is very salty.
If you have a low tolerance for this sort of thing, this may be a bit of a problem.
There are several ways to deal with this.
For example, before drinking SN, you can rinse your mouth with a very strong mouthwash.
You can also suck on some candy or something.
You can pinch your nose while drinking SN.
This will camouflage the flavor a bit.
4.
Enter SN in the internet search engine and check the applications for this product. The easiest way.
If you want to lie, you need to be confident, so you need to have appropriate knowledge about it, so it would be best if you read about it yourself.
Alternatively, you can come up with a completely false use for SN.
For example, if you have a hobby, you can tell your parents that you need a SN for this hobby.
But remember that your parents cannot have substantive knowledge about your hobby, and you need to be very convincing.