How do I manage fractures to my sacrum and help the healing ?

I have multiple fractures to my sacrum from a fall. I need help knowing how to help the healing process and my return to walking and increase my mobility. How do I know if I am causing harm. I am walking with a walker, but only in the hall of my home.
I need guidance on what I should be doing and what is causing more damage. My Orthopedic surgeon just says return to him when I am healed. How do I know if I am healed? Thank you