Once you read about it and have a mass of vocab and vague understanding of how it all works, draw your own diagrams or flow charts or something about how stuff works. Do that until you don't need to look at a book or anything and could sit and show someone how it works. This works for a lot of things besides A&P.
Visuals help a lot. Browse youtube. Look at publisher student supplement sites where you can go by chapter and look at outlines or images/video supplements.