This course has been co-taught at Southern Nazarene University by Howard Culbertson, SNU professor of missions, and Lyle Pointer, SNU professor who moved to Nazarene Theological Seminary in the fall of 2000. Here's a site with instructions and examples. Reaping isn't all there is to evangelism. In fact, reaping isn't even the hard labor.
Any farmer knows that.
It takes one day to harvest what you've cultivated and nurtured for months. Furthermore, the disciples were going to reap a harvest they hadn't sown. I planted, Paul said, Apollos watered, and God gave the increase. Paul handed off some souls to Apollos. God gave the increase.