I unwittingly bought a house with two giant Oak trees. As a novice Oak tree owner I have tried every known device to remove massive amounts of acorns. The easiest way I have found to date is to use a powerful electric leaf blower. I can even get acorns out of the lawn that are embedded in the soil. I flow the acorns to the sidewalk then sweep them up. It takes a little time, but is sure easier than trying to rake them.