I'm 5' 4" tall on a good day, and I can back the bike as long as there isn't an obstruction to stop the rear wheel. That means when I pull into the garage, I have to be sure not to stop where the asphalt drive has this itty bitty bump before the cement of the garage. I rocked that F6B six times before I had enough gumption to get it over that 1/2 inch spot of asphalt. Dang!

So I always am mindful of where I park, and make a point of having any downhill either on the way forward to clear space, or behind me to make the rolling out of a spot easier. So far I haven't had to ask for help. I'm seriously not above doing that!