BECOMING AN EXPERT FROM THE MIDDLE
First, how do you become an expert? Most of us assume that you need extensive training or extensive exposure to (in this case) a ministry dynamic.
Let's look at two examples of what it means to become an expert in business and in ministry. 

1. Bill Bright: How to Go into Business
Dr. Bright was asked what it would take to be successful as a business person. He paused and said, "First, I wouldn't get an MBA (typical way to become an expert). Instead I'd find the most respected business person I know and offer to be there assistant for a year. 
You'd learn more than any school could teach, and if you were serious and a real servant to this leader, you'd be offered a job at higher pay than if you came merely with academic training."

2. Turning Point in NYC
I was confronted with an opportunity and a dilemma some years ago. I had heard about Turning Point, a program offered by Teen Challenge. I was hesitant to offer the training because I didn't feel confident in the area of drug rehab.
I had a conversation with a leader of faith-based discipleship programs dealing with addictions, whom I highly respect. He asked, "When are you going to host Turning Point Training?" 
"But I am not an expert!" I countered.
He responded with the same question, "When are you going to host the training?" -- As if he hadn't heard my objection. He felt that Cru's regular interactions with pastors was the needed ingredient to help church leaders deal with the growing drug epidemic in the late 80s in NYC. He wanted us to connect the pastors to the "drug rehab experts," e.g., Turning Point trainers.
Over the next 5 years we facilitated the training of over 100 churches in how to host groups within their churches to help people overcome life-controlling issues such as drug addiction.
In other words, we knew churches. We knew the expert trainers. We simply put them together.
"But I'm not an expert!"
I would humbly say that I became an expert in drug rehab through that experience. As a matter of fact, I think I came to understand the breadth of gospel-based, drug-abuser discipleship better than some who had conducted in-house rehab for years.
I heard some "experts" say, you must get the abusers out of their community. Others said you must work with the abusers in their community. Who was right? They both were speaking from their situation which they knew well.