When thinking about the treatment options available for dealing with life's complications, there are an abundance of choices available. However, the use of each option can require a bit of assistance, in the beginning; so you don't "get in over your head", so to speak. You don't go swimming in the deep end of the pool without lessons first. The very same thing goes for self-help books. You don't want to get in "over your head" and drown, from all the information.
Think of the various treatment options as spokes on a wheel. Treatment options may, but not necessarily include: One on one psychotherapy, Small group therapy, Large group therapy, the use of medications to treat the condition.
There are also a plethora of "Self Help" books out there, to be used as another tool. I would never use a "self-help" book, without the recommendation of a professional. There are too many books out there, written by a great many people that do not have the credentials to be giving out advice. Just look at this blog. It is written by an untrained, uneducated simple-minded guy.
Yes, self-help books can be useful. I am not saying that they are not helpful. But, to use them without some "oversight" of some kind, is foolhardy. We all want to improve ourselves, yet, if we do not know HOW to improve ourselves, picking up a book might be the worst thing to do. Use some common sense before picking up a book to "cure" your ills.