The “art of friendly persuasion” sounds very complicated. However, it is just a matter of someone convincing someone to view and accept ideas from your point of view.
Requirements for effective friendly persuasion:
Have an honest interest in the prospect – Know what it is that would make their lives much easier. Actively listen to understand from their point of view.
Build rapport with the prospect, do not say things which will close the prospect off. Rather focus on their interests and build on from there. Asking open-ended questions will assist in building rapport.
Be sure that your body language mirrors what you are conveying verbally. Be sincere.