Place your car with lots of open space around it.
Understand how the turning radius of your car works, is it a
front wheel, 4 wheel or back wheel drive.
Walk around the car, with two fingers on the paintwork, tracing
and counting your small walking steps to know from bonet to
passenger side front wheel, how many small steps all around.
Then when you have to do turning, turn slow and count and
imagine your small steps you took to walk around your car, that
roughly will help you estimate how much more clearance you
have.