First...in the words of Douglas Adams "Don't panic". If you psych yourself up you very well may be mentally blocking yourself from learning this stuff. So let's make a game plan.
First pick up 1 book and your study guide. Read 1 chapter, do the example problems along in the chapter, follow the step by step and check your work against the book as you go along. Keep doing it until a light bulb goes off. Even if you never have that light bulb moment you should at least be left with specific questions.
Second, if left with specific questions write them down and continue to finish the chapter. You may answer your own questions as you go but repeat steps 1 and 2 as needed. If not, ask the "specific" questions you have. You can even hire an online tutor or maybe find a face to face tutor locally. Wikipedia also helps to break things down every once in a while.
Third, when you do get something, paraphrase what you have just learned in writing in your notes to be quick referenced later. This will help you cement what you just learned into your brain.
Fourth, before starting chapter 2 make sure you briefly review your notes and do so every time you start a new chapter.
Whatever you do take your time, set yourself a work schedule and goal and take things 1 chapter at a time. DO NOT LOOK AHEAD IN THE BOOK it'll only make things more difficult and serve no purpose. Do not work on more than one math subject at a time if possible. It'll only start to confuse you. You can do this.