Making it work is the hard part. The key is the preparation. For example, Mackay makes one speech each week. He spends about ten hours preparing for each speech by talking with people in the client's organization and often its competitors and suppliers. This allows him to hit the client's hot buttons and tailor the presentation to the expectations of the audience.
Preparation is very much a learning experience.
When he went to Taiwan for a seminar, he did a dress rehearsal in front of ten people who were going to attend. As a result of their comments, he junked some material and expanded other areas. To help prepare for the trip and the seminar he learned Mandarin Chinese. He made time by giving up lunch for a few months. Tapes of his lessons were played and replayed during drive time and fly time.