as easy as taking off the cover or shaking down the dead leaves; quite an easy matter/……至如说丞相 [公孙] 弘，如～耳。(《史记·汲郑列传》) It is such an easy matter for him to speak to Prime Minister Gongsun Hong.
发蒙振落fā ménɡ zhèn luò
发蒙：揭掉蒙在眼睛上的障碍物。比喻轻而易举。things easily accomplished without mental effort, quite an easy matter