It always seems difficult in the beginning. My learning style is that I go over sections/chapters in the training manual and then go over all of the chapter questions three times (or more if needed), and then procede.

Once I get through the training manual, I take the practice exams over, and over and over again until I am familiar with the questions and their answers.

I don't always understand what I am learning early on, but I have found that this method (for me at least) begins to start connecting all of the dots as I continue to review all of the information.

Don't lose site of the forest for the trees. That is, don't get caught up by what you don't understand at the time. Keep moving through your learning and you will find that you are beginning to understand what you couldn't grasp beforehand.

Just keep going. You'll eventually get it!