Learning something new is always important, however, who you learn it from is even more important than that. If you want to be a good evangelist that's fine, but why stop there? Search out the best and learn from them so you can become the best.
The greatest evangelist who ever lived was Jesus Christ. In three short years He turned a messed up world outside in and right side up. If we truly want to be great in our evangelistic attempts, then we should go no further than to learn from the greatest of all, Jesus Christ.