Practice the art of camoflague. Standing in the open draws unwanted attention. If you are a Shaman, act accordingly. Magic is deadly. If you don't fear it, learn to.
Discretion is the better part of valor.
Make sure your team is well balanced with a wide variety of talent, before going in. Once you are in a balanced team, know what your function is. Lessen the odds whenever possible. Think about where you are and how your actions will affect the situation. Learn to think on your feet.