One of the most important aspects of astrology is free will. When you approach the information in your natal chart with an active mindset it becomes a powerful tool for self improvement. Astrology is not your fate carved in stone, it's a set of guidelines or suggestions.
For example, let's say you consult an astrologer and find out that you're entering a "lucky" period courtesy of Jupiter (the planet of abundance). What should you do? You can sit back and wait for something to fall in your lap, but you'll probably see nothing. Jupiter works by expanding possibilities, so the key is to step up and work with the opportunities that appear. A little goes a long way with Jupiter and you'll be amazed at the returns.
It's the same idea if you're going through a dreadful Saturn period. If Jupiter is the party, Saturn is the hangover. It's the reality check that shows you the consequences of your actions. It asks that you expend maximum effort for what seems like minimum results. You can become discouraged and depressed. Or, you can find a way to make the restrictions work for you and realize that it's not about immediate payback. Things like commitments, careers, and weight loss can progress very nicely with Saturn.
Maybe you have a lot of Pisces energy in your chart, making you an artist but not an athlete. Pisces transcends the physical and is more in tune with the spirit than the body. If you decide you want to get in shape, are you out of luck? You may never excel at football, but activities like yoga and Tai Chi are a nice blend of physical and spiritual. The point is that you can choose.
I'm not telling you anything new here. Everything I've just written is common sense and so is astrology. It's nothing more than a guide to participating in your own life.