Makes me hope that set up at Dignitas is better organised.
The late great Sir Terry Pratchett, himself an advocate of assisted dying , did a very incisive documentary on this. He found a (very weathy) gentleman, who had signed up with Dignitas and this chap agreed to the whole process being recorded.
At the Dignitas House, he and his wife sat on a sofa. The lady from Dignitas asked him repeatedly if he still wished to proceed.
Finally she gave him a small cup of some poison. Before releasing it into his hand, she again asked if he was sure, as swallowing the contents would kill him.
Again, he agreed, and drank it. He quite quickly fell unconscious ( apart from croaking "water please" which was refused). He died, sat on the sofa, with his wife holding his hand.
Not at all unpleasant although his wife, I felt, disapproved but still went along with it.
One thing I did learn from the programme was that you have to be able to physically lift the cup and drink by yourself - they can't administer it to you, as that would make it murder.