My surgeon would not allow patients to leave the hospital until you could get in and out of a car, and go up and down steps.  There was a place in the hospital set up with a mock car & stairs to practice.  
You do need at least one good sturdy handrail. 
You also want to  avoid making lots of trips up and down the steps for a couple of weeks.  That can contribute to getting a hematoma, which you don't want.  Hold it to 3-4 trips daily right after the surgery.