Cat has a great way of explaining manifesting without coming across as New Age or arcane. She's more on the science end of this and makes no pretenses that this is all chemicals in our brains perceiving sensory input and converting them into other chemical reactions we refer to as emotions.
Her methods for manifesting are sound. One thing that made my head explode was her simple delineation of emotions vs. their opposites. I do disagree with a few of her conclusions. To me, the opposite of love is selfishness, not depression. Depression can be caused by a host of internal and external factors.
However, I do agree and strongly relate to one of her emotional pairings, as it is my issue: Feeling trapped/Stuck is the other side of feeling Secure.
Overall, this is a very hard truth approach to manifesting. Not to disparage some of the greats, like "Think and Grow Rich" or "The Strangest Secret", but the modern language Cat Howell uses makes this more accessible today. What I mean by that is, she is writing from an internet age, not from a time when men were the only ones working. The Strangest Secret is excellent and the advice is spot on, but I can only read so much about the "man of the household" and the "homemaker wife".