Cleveland you will find DeWitt's book to be significantly different in nature. It has been a while since I read Haris' book, but i recall it to be more focused on practical advice, much along the lines you quote.
DeWitt's book is more of an encyclopedic treatment of the history and theory of Epicurean philosophy. It will give you the foundation on which the philosophy is built and explain the many details that are very unfamiliar to most of us as we approach the philosophy for the first time. I recall that Haris does go over the outlines, but i think you will find that Dewitt really puts Epicurus in context with a general philosophical framework.
As we tell everybody please let us know if you have comments or questions as you read it. We have a whole section of the forum here devoted to discussing it chapter by chapter. You may find some things already there that will help you, but it's of great help to us if you make new comments or ask new questions as you read through it, so be sure to do that if you're at all inclined to.