I haven't written a book on that topic -- though it's one I've considered. (Generally, the interface between magic and astrology is poorly explored by current literature.) The very short form is that your horoscope, via the essential and accidental dignities of the planets and their house placements, tells you the strengths and weaknesses in your personality. Once you know those and understand them thoroughly, you can use a series of sephirothic workings to balance out the defects.