So I was wondering I know it's advised not to have allot of alcohol damage and it's also recommended to take a shot of baileys or something after drinking N.
But what if I'm drunk while taking the N, any harm done? My feeling to get over si would be to pour the N into a 200ml glass and when I'm already drunk, drink it intentionally and then goodbye
Don't "wonder". And don't get drunk first. This question has been answered here multiple times. Read the PPH.
(Excerpt from the 2018 edition):
Anti-emetics
In places where assisted dying is legal, Nembutal is invariably taken with a separate anti-emetic (anti-vomiting) drug. The anti¬ emetic will be taken as stipulated either for two days prior to the chosen night. Alternatively it can be taken as a single 'stat dose' around 40 minutes before the Nembutal is to be taken (see Chapter 9 for more explanation).
Eating something light
Have something light to eat so your stomach is not empty is generally considered a good idea. The chance of reflex vomiting brought on by drinking the bitter Nembutal liquid is reduced if there is something in the stomach. This should not be a significant meal that will slow the absorption of the drug. Something light is preferable, like tea and toast, an hour or so before taking the drug
A Safe Environment
An important consideration will be a peaceful, safe environment where one will not be disturbed. Usually this is best achieved at night.
Drinking Alcohol after the Nembutal The liquid in the glass can be drunk quickly in 2 or 3 swallows, and then followed by some alcohol, usually spirits or liqueur. Although not essential, alcohol is recommended as it alleviates the bitter Nembutal after-taste, and will speed the drug's action.
Mixing Nembutal with Something Else to take away the Bitter Taste
It is always better to take one's Nembutal straight. The likely result of mixing the Nembutal with something else (eg. yogurt) is the creation of a greater volume of an equally unpalatable substance. Furthermore, using a spoon to consume the drug, rather than drinking it, can mean a longer time to ingest the 100ml.
Exit has received reports of people falling asleep before all of the drug is consumed. This is dangerous. It is best to drink the 100ml in a few swallows, then drink alcohol.
How the Nembutal Takes Effect
The drug is absorbed from the stomach, and as the level in the blood rises, some crosses the blood-brain barrier and effects the part of the brain that controls sleep.
Within a few minutes of taking the drink the person falls into a deep sleep, quite often in mid-sentence.