Exactly. If you are a member of Exit and asks for their help- you are visited by one of the trained volunteers- who talks to you alone to find out exactly what the situation is, if you have any doubt or hesitation at all, and whether any outside 'pressure' is born to bear on you, be it from relatives, or anyone.
If they feel that there are any concerns re doubt/s or outside pressure, then they will not agree to support you and will say it is best to wait for a while. If they come to the conclusion this is what you really want, and that there are no outside influences, etc- they will set a date with you. On the day- the volunteer will visit and again speak to the person on their own to ascertain for sure that both above conditions are met- and then, and only when- will help the person take the potion and stay with them until death is confirmed- all is recorded properly, and then doctor and police called.
No slippery slope at all- and the GP is not involved at all with the 'deed', which I feel is far better.