I look behind me before getting into my car for any major obstacles, only check the sides for blind spots(which isn't usually an issue in a parking space) and rely on my side mirrors heavily. Very easy to navigate speedily in tight spaces(as opposed to those who reverse at like .2MPH and stop frequently, and continue to back out, even though they didn't change directions or movement while they were stopped for 5+seconds, like frequent stopping moves things out of obstruction).