Mark J. Farnham
The best way to learn, however, is not to keep reading and studying until you feel super-confident, with no doubts left regarding your ability.

I wanted to thank you so much for pushing me far out of my comfort zone and into new areas of evangelism. I am now confidently going door knocking with our church. I have also been sharing the gospel and inviting many people to our church. If it wasn't for you getting me out there and teaching me vital information, then I wouldn't be in the spot I am in now.
GC to AS