YES! Unless you are an attorney. Finding one will not be easy. Establishing a current fair market value, the terms of the lease option and advising you of all the risks and rewards are just a few to the details a Realtor can help you with.
It's critical that you not only use a Realtor, but that you find one experienced in this scenario. This is not taught in basic licensing classes, so experience & knowledge in this niche is critical.