Whatever you do like others have said, no good or clean way of getting out.
Even as highly influential Raymond Franz was, he said his books are not made to get people out of the organization. It is more like, they will get out when their own time comes.
I always see THOSE wanting to leaving the ORGANIZATION as being on a LONG QUEUE. You are on the QUEUE when it gets to your turn, you will either drop the resignation letter, fade, disfellowshipped or disassociate.
Despite how close I was with a number of those within the congregation, sometimes reasoning with them both during meetings, field service, normal gatherings on some of the beliefs that call the organization being JEHOVAH'S organisation into question none ever asked me or seek clarification personally from me up till today the reason I decided to disassociate.
how do you think best to do this? Any ideas?
My advice is to watch out for the thought police(not limited to the elders, Ms but it extends to their wives, children and every other member of the congregation)
They will get you if you are not careful and in the will to get members woken up you will be brutally exited from the organization and the efforts and good standing all these years goes into the drain and get thrown under the bus. Watch your back. The Informant mechanism is always in place.