Garybuss hit the nail on the head, at least in my own personal case.
I was a witness long before I ever came to the organization. I had studied the books on my own and loved the hope of a beautiful paradise restored on earth.
In fact, I never had a study conducted with me and went out in service the first week that I met for the first time at the Kingdom Hall.
I remember it well. Went out in service with a Circuit "servant" back in those days named R.C. Benson.
I think studying with a person is important, but going golfing or hunting or fishing with a student is a deal closer. I used to get lots of folks going by doing that.
Also had studies for 3 years that attended only Memorial.
Brant