Transitioning legal careers

Q: My first and only job since graduating from law school in 2007 has been as an Assistant D.A.. After 4.5 years at DA’s office, I am now looking to transition out of criminal law and into the private sector, specifically into the area of wills, trusts and estates. I do not have experience in those fields of law, outside of my law school courses, but what can I do to make myself marketable to those firms that emphasize those practice areas?