Question: Is it possible to start the practice of Buddha Name Recitation from written instructions only, or does it require personal instruction for an ordained monk?
Response: There is no need to receive specific instructions from a Pure Land monk or nun to practice chanting "Amituofo". As you are chanting, the sound of “Amituofo” arises in your mind. And as you utter “Amituofo,” your mind should concentrate on and embrace that sound. While chanting, do so sincerely and continuously.
There are some other entries that address chanting on the blog. You can click on the September 3rd and July 30th internals links for some additional thoughts on chanting.